What was one outcome of the Persian Wars? O Xerxes I became the leader of Greece.
O The Persian Empire became part of Greece.
Athens and Sparta increased their power in Greece.
The Persian army took control of the city-states in Greece.

The changes to agriculture in the united states since 1900 is that increased mechanization has increased food production, thereby increasing the need for labor. there has been an increased need for higher speeds of food production due the fact that the population in the united states continues to rise.