Countries That No Longer Exist

Which republic proclaimed independence in 1836 from Mexico and became the twenty-eighth state in 1845?
Name the Ethiopian Empire which lasted from the 13th to 20th century?
Which seventh-century empire was conquered by China around 1950?
Which former country was the Kingdom of Serbs, Croats, and Slovenes before becoming a socialist federation of six republics in 1946?

In July 1755, where did Pasquale Paoli proclaim a sovereign state independent from the Republic of Genoa?
Which country united in 1964 with Tanganyika to form Tanzania?
Which kingdom was the leading state of the German Empire until its dissolution in 1918?
Which sovereign state and maritime republic in Northeast Italy, existed between the 8th century and 1797?
Which historical, central European country bounded on the south by Austria, now forms much of the Czech Republic?
The Republic of New Granada was a republic from 1831 to 1858 on which continent?
Which British dominion in eastern North America voted to join Canada in 1949?
What was an independent republic from 1894 until 1898, when it officially became a U.S. territory?
Which principality on the Danube River joined Moldavia in 1859 to form the state of Romania?
Sikkim was a sovereign Monarchical State until it merged with which country in 1975?