Horace Mann was known for his work in education reform. There's even a famous private school named after him for exactly this reason. Your best answer is A.
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Portugal, Switzerland, Italian states,
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“The age of Constantine marked a distinct epoch in the history of the Roman Empire, both for founding Byzantium in the east, as well as his adoption of Christianity as a state religion.
As emperor, Constantine enacted many administrative, financial, social, and military reforms to strengthen the empire.
Constantine experienced a dramatic event in 312 at the Battle of the Milvian Bridge, after which Constantine claimed the emperorship in the west and converted to Christianity.
According to some sources, on the evening of October 27, with the armies preparing for battle, Constantine had a vision of a cross, which led him to fight under the protection of the Christian god.
The accession of Constantine was a turning point for early Christianity; after his victory, Constantine took over the role of patron of the Christian faith.”
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Purchase of Alaska, 1867
The purchase of Alaska in 1867 marked the end of Russian efforts to expand trade and settlements to the Pacific coast of North America, and became an important step in the United States rise as a great power in the Asia-Pacific region. Beginning in 1725, when Russian Czar Peter the Great dispatched Vitus Bering to explore the Alaskan coast, Russia had a keen interest in this region, which was rich in natural resources and lightly inhabited. As the United States expanded westward in the early 1800s, Americans soon found themselves in competition with Russian explorers and traders. St. Petersburg, however, lacked the financial resources to support major settlements or a military presence along the Pacific coast of North America and permanent Russian settlers in Alaska never numbered more than four hundred. Defeat in the Crimean War further reduced Russian interest in this region.
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