Investors saw a decent Wall Street performance in April. The S&P 500 index saw its third consecutive month of gains last month, rising more than 5%. The other two broader indices like the Dow Jones Industrial Average and Nasdaq Composite were up 2.7% and 5.4%, respectively, in April. Notably, investors continue to be optimistic about recovery in economic growth from the pandemic-led slowdown.In this regard, Jack Ablin, chief investment officer at Cresset Capital, has said that “investors are gearing up for another busy earnings week capped off with a widely watched jobs report. Given the positive economic and earnings news, the path of least resistance appears higher,” per a CNBC article.Investors who want to gain from the steadily recovering U.S. economy can consider momentum ETFs. Before discussing about the available ETF options in details, here we highlight the most powerful reasons why you should invest in them:Streak of Upbeat U.S. Economic DataThe U.S. economy grew an annualized 6.4% in the first quarter of 2021, breezing past expectations of 6.1%, following a 4.3% uptick in the previous three-month period. Apart from the reopening-driven third-quarter jump last year, the latest reading marked the best period for GDP since the third quarter of 2003.The latest U.S. consumer confidence data looks encouraging as the metric has risen for the second consecutive month in April. Markedly, the metric had hit a one-year high in March. The Conference Board's measure of consumer confidence index stands at 121.7 for April, comparing favorably with March’s revised reading of 109. Moreover, April’s reading beat the consensus estimate of 113.0, per a Reuters’ poll. Notably, the metric stands at the highest level since last February, when the index was at 132.6.Falling New COVID-19 CasesThe world’s largest economy is seeing a decline in the seven-day average of daily cases now. The metric dropped to under 50,000, declining 17% from the previous week (as of May 1), per a CNBC article. There has also been a decline in the number of hospitalizations along with a decreasing death toll from coronavirus infections.In fact, former U.S. FDA commissioner Scott Gottlieb is predicting a “relatively quiet summer when it comes to coronavirus spread,” as mentioned in a CNBC article. Going by the same article, he has also said on CBS News that “look, the situation in the U.S. continues to improve, and I think in the coming weeks we are going to see an acceleration in the decline in cases.”Accelerated Vaccine DriveA large COVID-19 vaccination drive has buoyed hopes of faster U.S. economic reopening of non-essential businesses and the return to normalcy. Strengthening the optimism, the United States has administered around 200 million doses of vaccines under 100 days of Biden administration, per a CNN report. According to the U.S. Centers for Disease Control and Prevention (CDC), more than half of American adults have received at least one vaccine dose, per a Reuters article.Momentum ETFs Worth Your AttentionMomentum investing looks to fetch profits from hot stocks that have shown an uptrend over the past few weeks or months. Here we present five ETFs that could outperform on the current market optimism. Further, these could beat broader market returns in the coming months if the optimism prevails.iShares MSCI USA Momentum Factor ETF MTUMThis fund provides exposure to large and mid-cap stocks that exhibit relatively higher price momentum by tracking the MSCI USA Momentum SR Variant Index. It charges 15 basis points (bps) in fees per year and is a popular choice, with AUM of $14.95 billion (read: ETF Strategies to Play the US Market Optimism).Invesco DWA Momentum ETF PDPThis fund tracks the Dorsey Wright Technical Leaders Index, which measures the performance of companies that demonstrate powerful relative strength characteristics. It has amassed $1.81 billion in its asset base and charges 62 bps in annual fees (read: Momentum ETFs to Gain From the New Stimulus Optimism).Invesco S&P MidCap Momentum ETF XMMOThis ETF follows the S&P Midcap 400 Momentum Index, which is designed to identify mid-cap firms with the highest momentum scores. XMMO has AUM of $971.5 million and an expense ratio of 0.34% (read: ETF Investing Areas Looking Attractive After a Blue Wave).VictoryShares USAA MSCI USA Value Momentum ETF ULVMThis fund tracks the MSCI USA Select Value Momentum Blend Index, offering exposure to large and mid-cap companies with higher exposure to value and momentum factors, while maintaining a moderate turnover and lower realized volatility compared with the traditional capitalization weighted indices. It accumulated $449.5 million in AUM and charges 0.20% in expense ratio.SPDR Russell 1000 Momentum Focus ETF ONEOWith AUM of $289.3 million, this product targets large-cap securities with a combination of core factors (high value, high quality and low size characteristics) and a focus factor comprising high momentum characteristics. It follows the Russell 1000 Momentum Focused Factor Index and charges an annual fee of 20 bps (read: 4 Momentum ETFs That Still Offer Value).Want key ETF info delivered straight to your inbox?Zacks’ free Fund Newsletter will brief you on top news and analysis, as well as top-performing ETFs, each week. Get it free >>Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report INVS-DWA MO PO (PDP): ETF Research Reports SPDR-R1000 MF (ONEO): ETF Research Reports ISHRS-MSCI US M (MTUM): ETF Research Reports VS-US MS USVMOM (ULVM): ETF Research Reports INVS-SP MC MOM (XMMO): ETF Research Reports To read this article on Zacks.com click here. Zacks Investment Research Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report