Some background:The event that brought USA into WWI is the Pearl Harbour Incident ,where Japna launched an surprise attack to the US Naval Base in Pearl Harbour.
The favorable factor is that she join the war late with sufficient resources and the morale was high among soilders,while the other nations were starting to worn out ,already suffering from casualties. Not to mention America also had advanced technology and great economy to support her operation in WWI. This gave America a huge advantage in the war.
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to protest for jobs and freedom for African Americans. King delivered his iconic “I Have a Dream” speech on the steps of the Lincoln Memorial. The March on Washington is credited with helping pass the Civil Rights Act of 1964
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Crusades, military expeditions, beginning in the late 11th century, that were organized by western European Christians in response to centuries of Muslim wars of expansion. Their objectives were to check the spread of Islam, to retake control of the Holy Land in the eastern Mediterranean, to conquer pagan areas, and to recapture formerly Christian territories;