user: Why did the US join WW2?

assistant: The Japanese attack on Pearl Harbor on December 7, 1941, ended the debate over American intervention in both the Pacific and European theaters of World War II. The day after the attack, Congress declared war on Imperial Japan with only a single dissenting vote. Germany and Italy— Japan’s allies—responded by declaring war against the United States. Faced with these realities and incensed by the attack on Pearl Harbor, everyday Americans enthusiastically supported the war effort. Isolation was no longer an option.

user: Which is the best soccer team of all time?

assistant: It is hard to say since there could be multiple rankings to answer this question. 

Assuming the best soccer players end up playing in Europe, we could take into consideration the European Champions League winners. Using this ranking, Real Madrid, having won 14 trophies, could be considered the best soccer team in the world.

Alternatively, Fifa awarded Real Madrid the “soccer club of the 20th century” after winning a popular poll with 42.35% of the votes.

Everything around soccer teams is very subjective and feelings could play a big part for everyone's answer.

user: Describe the video game crash of 1983 in 2 sentences.

assistant: Home video game revenues in North America declined from $3.2 billion in 1983 to around $100 million in 1985. This decline – which preceded the success of the Nintendo Entertainment System – is referred to as the video game crash of 1983.