Final answer:
The Vatican City was under siege between 1870-1929 due to the capture of Rome during the unification of Italy. It was a political conflict rather than a violent siege, and the Vatican City itself was not captured.
Step-by-step explanation:
The Vatican City was under siege between the years 1870-1929 due to the capture of Rome by Italian nationalists during the unification of Italy. This led to the loss of the Papal States, including the city of Rome, which became the capital of Italy. However, the Vatican City itself, where the Pope resides, was not captured during the siege. Instead, the Vatican City was declared an independent city-state in 1929 through the Lateran Treaty, which ended the conflict between the Vatican and Italy.
During this period, there were tensions and disputes between the Vatican and the Italian government, but it was not a violent siege in the sense of a military attack or assault on the Vatican City itself. It was more of a political conflict and power struggle between the Holy See and the Italian government.