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create a timeline of the american revolutionary war from 1775 to 1783.
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1775: the revolutionary war begins with the battles of lexington and concord

1776: declaration of independence signed; british evacuate boston; washington defeats howe in battle of long island; washington crosses the delaware and defeats hessians in battle of trenton

1777: british forces under general howe capture philadelphia; battle of saratoga

1778: france allies with the colonies; battle of monmouth

1779: spain allies with the colonies; washington launches sullivan's expedition

1781: british forces surrender at yorktown; british evacuate philadelphia

1782: france, britain, and spain sign the treaty of paris

1783: the revolutionary war officially ends with the treaty of paris.
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