The Greeks introduced a system of political reforms that they called demokratia, or “rule by the people.” ... Although this Athenian democracy would survive for only two centuries, Cleisthenes' invention was one of ancient Greece's most enduring contributions to the modern world.
The answer is Tariff of 1816.
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Answer:
In fact, immigrants contribute to the U.S. economy in many ways. They work at high rates and make up more than a third of the workforce in some industries. Their geographic mobility helps local economies respond to worker shortages, smoothing out bumps that could otherwise weaken the economy.
It was a chain reaction. Long story short, the countries were pulled into the war because of agreements they had with their allies. This treaty is what caused the countries to enter WWI, to protect and defend their allied countries who were already in the war.