Step 1: Background of the American War of Independence:
The American War of Independence (1775--1783) was a major conflict in which thirteen American colonies successfully rebelled against British rule to establish the United States of America.
Step 2: Military and Presidential Role:
George Washington served as the Commander-in-Chief of the Continental Army throughout the war. His military leadership and strategic victories (such as at Trenton, Princeton, and Yorktown) were central to the colonial victory. Following the ratification of the US Constitution, he was unimously elected as the first President of the United States.
Step 3: Alyzing Other Options:
• (A) Abraham Lincoln served as President much later, leading the country during the American Civil War (1861--1865).
• (B) Thomas Jefferson was the principal author of the Declaration of Independence and served as the third President, but did not command the army during the war.
• (C) John F. Kennedy served as President in the mid-$20^{\text{th}}$ century during the Cold War.