After Alexander's death, Greece and Macedonia were ruled by Antipater.
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The French Naval support at Yorktown prevented the British from reinforcing and/or evacuating their troops, forcing their surrender.
Himalayan Rivers contain large quantities of sediment with hard abrasive particles, which is a hurdle for the economic exploitation of hydropower resources. The design and operation of headwork components in hydropower plants can only manipulate sediment particle size and hence only sediment concentration in the water.