Well, the earliest war during the twentieth century was World War I, but if you're asking about 1900 specifically, I'm not sure if there was any officially declared war that the United States was involved in. Later, World War II and the Korean and Vietnam Wars ensued.
Answer:
1946, 1949, 1954, 300,000, $1 billion
Explanation:
Your answer is false
hope it helps
Answer:
alongside the devlopwm of agriculture
Explanation:
you see I 10000 bce humans began farming and went from nomadic to sedentary and so humans could start producing surplus of grain and it allowed others to chose different jobs (really I think it was the discovery of bronze but nvm)