The area that is now Bangladesh was part of India under British rule. It was part of a historical land called Bengal.
In 1947, Bengal was divided into West Bengal, which became part of India, and East Bengal, a province of Pakistan. Till 1971, there was a struggle in East Bengal to free it from Pakistani occupation.
Bulgaria entered World War I on the side of the Central Powers (German Empire, Kingdom of Italy and Austria-Hungary).
In World War II, it sided with the Axis powers (along with Hungary, Romania, and Finland, among others). Unlike other Axis powers, it did not take part in the aggression against the USSR in 1941.
Vatican City is the only country in the world where Latin is the official language.
In addition to Latin, Italian is the second official language there. The Pope uses Latin in important ceremonies, and official documents are still written in this language.