The correct answer is - Russia.
The Bulgarians tried to gain independence from the Ottoman Empire, and a key component in that was the Bulgarian National Revival, and in 1876 the Bulgarians had an uprising in the month of April, but the Ottomans were too strong so it was unsuccessful. This triggered Russia to intervene, since it had a big interest in the Balkans, so that prompted another war between the Russians and the Ottomans, with the Russians winning and Bulgaria managing to get its independence in 1878.
Lincoln had several good arguments against slavery
This was in a party that had a strong disdain for slavery and enjoying wide spread support in the North where the institution was frowned upon. Lincoln use of slavery to drive his political agenda was in full cognizant that it would tear the country into half.
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Many of the concerns raised by anti-federalists were about giving the government too much centralized power, as well as its lack of protections of the rights of citizens (which were laid out in the Bill of Rights and subsequent amendments)
