Why did the persion war begin?

The Persian wars against Greece were caused because the Darius, the Persian king, wanted to expand their empire. The wars took place in the early 5th century B.C. but the first attack was around 490 B.C. but the Persians lost. The wars also led to the unity between the Greeks.

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Explanation:

nothing certain is known about what happened, but it seems that the country declined gradually, perhaps due to bad government, or, more likely, due to a series of bad harvests, which resulted in widespread and recurrent famine.

lincoln presided over the union victory in the american civil war, which dominated his presidency. a former whig, lincoln ran on a political platform opposed to the expansion of slavery in the territories. his election served as the immediate impetus for the outbreak of the american civil war.