<span>Revivalism swept across the United States in the early 19th century.</span><span />
The only unifying force in Europe following the fall of the Roman Empire was the Christian Church (Christianity). Emperor Constantine issued the Edict of Milan in 313 AD accepting Christianity. It became the official religion of the Roman Empire ten years later.
Twelve countries were involved in WWI.
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Explanation: The Platt Amendment was an amendment made in 1901 to a resolution of the United States Congress. It said that all treaties with Cuba had to be approved by the U.S. Senate and the U.S. had the right to interfere in Cuba's affairs if order broke down within Cuba.
On the Pine Ridge Reservation in South Dakota, some 200 Sioux Native Americans, led by members of the American Indian Movement (AIM), occupy Wounded Knee, the site of the infamous 1890 massacre of 300 Sioux by the U.S. Seventh Cavalry. The AIM members, some of them armed, took 11 residents of the historic Oglala Sioux settlement hostage as local authorities and federal agents descended on the reservation.