What was the main effect of the persian wars

Athens became the leader of the Greek city-states as a result of the Persian wars.

Explanation:

The main effect of the Persian wars was that Athens became the leader of the Greek city-states since they formed an alliance which came to be known as known as the Delian league. The Delian league became a very strong force that was able to withstand their possible conquest.

- three-quarters or two-thirds..

- "the constitution provides that an amendment may be proposed either by the congress with a two-thirds majority vote in both the house of representatives and the senate or by a constitutional convention called for by two-thirds of the state legislatures."

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during the 20th century, the role of the vice president has evolved into more of an executive branch position. now, the vice president is usually seen as an integral part of a president's administration and presides over the senate only on ceremonial occasions or when a tie-breaking vote may be needed.