Has there ever been any time in history a border wall has proven effective? Explain your reasoning.
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A border wall is a physical barrier between two countries, usually erected to stop the flow of people and goods between the two countries. Border walls have been used throughout history, with varying degrees of success.

The most famous border wall is the Great Wall of China, which was built over 2,000 years ago. The Great Wall was designed to keep out invading armies from the north, and it was largely successful in its goal. The wall is over 5,000 miles long, and it is one of the most impressive engineering feats in history.

More recently, the United States has built a border wall along its southern border with Mexico. The wall is over 700 miles long and is designed to stop illegal immigration and drug trafficking. The wall has been partially successful in achieving its goals, but it has also been criticized for its cost and for the negative impact it has on the environment.

Border walls have been used throughout history with varying degrees of success. The most famous border wall is the Great Wall of China, which was built over 2,000 years ago and was largely successful in its goal of keeping out invading armies. The United States has also built a border wall along its southern border with Mexico, which has been partially successful in achieving its goals, but has also been criticized for its cost and for the negative impact it has on the environment.