Arrange the events in chronological order.
The Fourth Crusade attacked and sacked the city of Constantinople.
Western countries launched a series of crusades.
The Ottoman Turks conquered Constantinople.
The Byzantine Emperor sought the crusaders’ help to defeat the Arab Muslims.

Ally just bought a plane ticket. she notices that the fare includes a september 11 security fee. what is the government’s purpose for imposing this fee? a. to pay for security at airports b. to pay for airplane maintenance c. to compensate airlines for rising fuel prices d. to pay for new government airplanes