Hamas has also initiated unilateral ceasefires (called "tadiyah") that Israel has broken.
The actual timeline is that in 2006, Hamas won the elections (hence the "takeover") despite Israel prohibiting them from campaigning and arresting their candidates.
Upon their election, Israel put them under sanction, prohibited them from traveling between the two parts of Palestine they had been elected to run, withheld governmental money owed to the PA, and sponsored a coup against their government (which pushed them out of the West Bank, hence Hamas' exclusive control of Gaza).
AFAIK, elections have not been permitted in the PA since then.
The actual timeline is that in 2006, Hamas won the elections (hence the "takeover") despite Israel prohibiting them from campaigning and arresting their candidates.
Upon their election, Israel put them under sanction, prohibited them from traveling between the two parts of Palestine they had been elected to run, withheld governmental money owed to the PA, and sponsored a coup against their government (which pushed them out of the West Bank, hence Hamas' exclusive control of Gaza).
AFAIK, elections have not been permitted in the PA since then.