00:00But how have the United States never been invaded for more than 200 years?
00:04First of all, the United States, Mexico and Canada,
00:08are relatively inferior,
00:09both economic and military,
00:11since the United States possess the first military power in the world.
00:15The United States being the main power in the North America,
00:19an invasion of their part would be defeated without other powerful United States.
00:23Secondly, the United States are surrounded by two oceans,
00:26in the United States and the West.
00:28In addition to having the most powerful marine in the world,
00:31they have many avant-posts in the open oceans,
00:34which makes all maritime invasions extremely difficult.
00:39In summary, the combination of the economic and military superiority
00:43of the United States compared to their neighbors,
00:45and their advantageous geography with oceans such as natural barriers
00:49have contributed to maintaining the continental territory of the United States
00:54for more than two centuries.
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