How did changing alliances in Europe lead to Seven Years' war and how was the war carried out on a global scale

France and Austria figured out that if they become allies, even though they were enemies for decades before, they could prevent Prussia and Britain from becoming stronger. Britain allied itself with Prussia to fight against them. It was fought on all continents using colonists. For example, the US colonies had to fight the Canadian colonies. African colonies also fought, and also Asian ones.

roosevelt essentially took the opposite approach as hoover in taking on the great depression. herbert hoover thought that america and its economy could naturally recover from the depression in due course, so he adamantly restrained the federal government from intervening on behalf of the people affected. on the other hand, roosevelt dramatically increased employment by expanding the federal government and establishing agencies that would aid in relieving some of the country's worst problems.