<em>Civil wars and foreign invasions showed that the empire had become too large to be ruled by one person.</em> :-)
If you meant that question literally then the answer is the America got all his land mostly by the battle of independence from Great Britain in which it got all the territory that the british took or claim after the french-indian war in which france and the british sign a treaty which stated that all territory gain from battle most be return. In which the british later =send a huge debt to the 13 colonies that stated that they most pay for all the damage done thanks to the french and indian war
The United States bolstered the Afghan resistance warriors after the USSR's 1979 attack on Afghanistan. Their ill-conceived intrusion transformed into a setback-filled and money related failure as the Afghans battled dauntlessly - and with American hello there-tech weapons, for example, Stinger rockets, at last, drove the Soviets from their nation.
