The war between the United States and Canada-18 12. The newly established United States expanded around the North American continent and played the idea of neighboring Canada. At that time, Canada was a British colony, and others could not sleep well by the sofa, so the British led the Canadian militia and Indians to form a Coalition against the American invasion.

And in 18 13, President Madison led the government to flee, and the angry British Coalition forces set fire to the presidential palace and the parliament building.

So that after Madison government came back, facing the burnt-out presidential palace, it had no choice but to paint it with white ash, which led to the current "White House". The United States brazenly called this war "the Second War of Independence" and set up festivals to celebrate it.

Korean War-1June, 950, with Stalin's consent, North Korea crossed the 38th parallel and attacked South Korea. Subsequently, the United Nations troops and volunteers from 16 countries led by the United States joined the war one after another, which neither China nor the United States knew before the war broke out.

It can be said that North Korea's "undeclared war" (the war evolved into a confrontation between two camps with different ideologies. Both sides invested more than one million troops each. Until 1953, Panmunjom signed an agreement. Taking the 38th parallel north latitude as the dividing line between North and South Korea, China, North Korea and the Soviet Union suffered 650,000 casualties, while the United States and South Korea suffered 570,000 casualties.

Vietnam war-1955 ~ 1975, the United States intervened to implement its Asia-Pacific strategy. After four presidents, Eisenhower, Kennedy, Johnson and Nixon, it took a long time and finally ended with the withdrawal of American troops and the victory of North Vietnam. In the war, about 300,000 people died in South Vietnam, 58,000 in the United States and1180,000 in North Vietnam, which was very tragic.

World War I in Afghanistan-this war is more subtle. It was triggered by the 9 1 1 attack on the World Trade Center in 200 1, and it was announced by President Obama in 20 14. Killing bin Laden militarily and defeating the Taliban can be said to have achieved the goal.

However, during the war, the United States invested 1 trillion in military spending, and the US military killed 2,000 people and fell into a quagmire. More importantly, from the pre-war dominance to the post-war rise of East Asian powers. This was unexpected by the United States, so the basic victory of the campaign was a strategic mess, which was not worth the loss.