• Global financial markets rise after a U.S. court ruling blocks Trump's sweeping tariffs.
• The S&P 500 and Nasdaq see significant gains, driven by Nvidia's strong earnings.
• Uncertainty remains as the White House appeals the court's decision on tariffs.
• The ruling affects several tariffs but leaves many intact, maintaining trade policy ambiguity.
• Asian markets react positively to the news, with Japan's Nikkei rising 1.9%.

Financial markets around the world rebounded sharply on Thursday following a ruling by a U.S. court that blocks President Donald Trump's ability to impose sweeping tariffs under the International Emergency Economic Powers Act. The S&P 500 futures rose 1.5% and the Nasdaq surged 1.5%, with chipmaker Nvidia leading the charge after reporting strong earnings growth, according to NPR, New York Times, SFGate, and India Times.

The U.S. Court of International Trade's decision invalidated the use of tariffs, citing that Trump's legal basis for imposing such duties did not authorize them. Despite the ruling providing a boost to investor confidence, it remains subject to appeal, which the White House initiated almost immediately. This uncertainty continues to loom over future trade policy and could lead to further fluctuations in the markets, according to ABC News, South China Morning Post, and CBS News.

The ruling affected various tariffs initially imposed on countries like China, Canada, and Mexico, and analysts suggest it offers short-term relief but complicates long-term strategies for businesses. Nvidia's impressive financial performance contributed significantly to the positive sentiment, with its stock jumping 6% in after-hours trading, reinforcing the tech sector's recovery, as noted by NPR and New York Times.

In Asian markets, Japan's Nikkei 225 index surged by 1.9%, and South Korea's Kospi also rose 1.9%, indicating strong regional confidence in light of the tariff ruling. Despite gains, the ongoing uncertainty about the future of U.S. trade policy, particularly as some tariffs remain intact under different legal statutes, casts a shadow on the rally's sustainability, according to India Times and South China Morning Post.