I’m not sure about this question
Advances in radar and mine detection technology.
Moreover, Alliances are formed for various reasons, such as the need for financial or military support, trade agreements, investments or loans. Alliances became strong in the early 19th century when European states either wanted to support the French dictator Napoleon Bonaparte or to defeat him.
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In the late 1940s, the United States responded to the growing threat presented by the Soviet Union by trying to stem the tide of Communism by supporting and propping up governments that opposed Communism.
In Common Sense, Thomas Paine argues for American independence. His argument begins with more general, theoretical reflections about government and religion, then progresses onto the specifics of the colonial situation. ... Government has its origins in the evil of man and is therefore a necessary evil at best.
The simple answer here is because of slavery.