Major U.S. stock indexes traded lower in late-morning activity on Monday as two significant stories dominated market attention and geopolitical headlines.

President Trump announced that the United States would take on a guardian role over the Strait of Hormuz, one of the world’s most strategically critical waterways for global oil flows.

The declaration came amid ongoing exchanges between the U.S. and Iran, raising fresh concerns among investors about energy supply stability and broader Middle East tensions.

The Strait of Hormuz connects the Persian Gulf to the Gulf of Oman and handles a substantial portion of the world’s seaborne oil shipments, making any security developments there closely watched by energy markets.

Trump’s positioning of the U.S. as a primary security guarantor in the region marks a notable shift in rhetoric that could have lasting implications for American foreign policy and naval commitments.

Separately, Meta Platforms (NASDAQ: META) announced plans to invest more than $50 billion in a data center expansion in Louisiana, underscoring the company’s aggressive push to scale its artificial intelligence infrastructure.

The Louisiana investment represents one of the largest single-state data center commitments in U.S. history, reflecting the enormous capital requirements now driving competition among major technology firms.

Meta’s stock slipped 1.40% during Monday’s session, as broader market sentiment weighed on technology shares despite the bullish long-term signal the infrastructure announcement sends to investors.

Apollo Global Management (NYSE: APO) also saw shares dip 0.47% during the same trading period, with all three major U.S. stock indexes posting losses in late-morning trading.

The confluence of geopolitical uncertainty around Iran and heavyweight corporate investment news created a mixed backdrop for markets, with traders weighing long-term growth signals against near-term risk factors.