Global oil prices continued their decline Thursday, fueled by growing optimism that a diplomatic agreement between the United States and Iran could soon allow crude tankers to resume deliveries from the Persian Gulf. This positive sentiment, however, saw the S&P 500 dip slightly from its record high as markets reacted to the evolving geopolitical landscape. Brent crude, the international benchmark, fell 0.5 percent to $100.71, a notable drop from $115 earlier in the week. While still considerably higher than pre-war levels, financial markets are buoyed by Iran 's announcement that it is reviewing the latest U.S. proposals aimed at ending their conflict. On Wall Street, the S&P 500 retreated 0.3 percent from the all-time high it reached the previous day.…