The Constitution explicitly assigns the president the power to sign or veto legislation, command the armed forces, ask for the written opinion of their Cabinet, convene or adjourn Congress, grant reprieves and pardons, and receive ambassadors.
B. the period when many Western Europeans traveled across the Atlantic and Pacific oceans for the first time.<span>
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For a start, the surveillance in airports throughout the world has been modified ( full body scans, long lines, no liquids allowed, etc). Society became aware of terrorism and deportation since 9/11 was massive. Before that date, society has never heard of Al Qaeda, Bin Laden, Taliban movements and terrorist groups.
The Khmer empire was a powerful state in South East Asia, formed by people of the same name, lasting from 802 CE to 1431 CE. At its peak, the empire covered much of what today is Cambodia, Thailand, Laos, and southern Vietnam.
By the 7th century CE, Khmer people inhabited territories along the Mekong river -the world’s seventh longest river - from the delta to roughly the modern Cambodia-Laos border, plus the region between that river and the great Tonle Sap lake to the west and the area running along the Tonle Sap river (which runs from the lake to the sea, joining the Mekong in the delta). There were several kingdoms at constant war against each other, with art and culture heavily influenced by India due to long established sea trade routes with that subcontinent.
I hope this helps
The Cold War ended when the Berlin Wall came down, and all across Eastern Europe free elections put an end to Communist regimes, until finally the Soviet Union itself broke apart.