During the British Mandate (1918-1948), Nablus became the core of Palestinian Nationalism, and it was the center of resistance against the British. After the 1948 Arab-Israeli war Nablus came under Jordanian authority, and 2 refugee camps were built near the city. In 1967, Nablus was occupied by the Israeli army, the occupation damaged the infrastructure of the city. The hard years of the occupation caused much damage to the city, 3 refugee camps were added to accommodate the people who fled to the city.
Nablus was invaded and occupied in 2002 during the Second Intifada, and has been raided frequently ever since. Nablus has a particularly high concentration of open anti-Israeli sentiments for a major West Bank city; you can see many memorials to Palestinians killed during Israeli attacks in the old city, and the IDF and Palestinian militants occasionally clash in some parts of greater Nablus such as the refugee camps. There are many damaged buildings and debris-filled fields around Nablus, the result of past Israeli aerial bombing, but the residents of Nablus have been working hard on repairing their city and there's less and less visible damage every day