Despite the Iran war turmoil, buy-and-hold investors in U.S. markets have prospered in 2026. The S&P 500 recovered from March losses with a 10.7% April rally, reaching new peaks. This resilience continues a historical pattern where markets often outperform following geopolitical conflicts, demonstrating that market timing matters less than long-term persistence for patient investors.

Historical data reinforces the strategy. Since 1927, the S&P 500 has delivered 9.8% annualized returns, including dividends, despite numerous wars and crises. After recent conflicts, the index gained 12.5% in the year following the start of hostilities. In the current war's first seven weeks, stocks rose 3.6%, showing that even amid uncertainty, broad market exposure has proven beneficial.

The practical approach involves maintaining proper asset allocation between stocks, bonds, and cash based on personal risk tolerance. While index funds won't deliver spectacular returns like Nvidia's 22,000% decade-long surge, they provide reliable market exposure. Diversification with bonds offers stability during market volatility, creating a balanced portfolio strategy that has withstood decades of economic turbulence.