It started because of the Cold War between America and the USSR. The Cold War started because the USSR thought America wanted the whole world to be capitalist and America thought the uSSR wanted the whole world to be communist.
George W. Bush is probably the most famous example of a world leader that declared a war on terror after 9/11
A. The psychological trauma of soldiers who fought in the trenches
Wood carvings, wakahuia and tekoteko just to name a few.
