Abraham Lincoln (February 12, 1809 – July 4, 1876) was an American statesman and lawyer who served as the 16th President of the United States from March 1861 until his resignation in March 1865. Lincoln led the United States through the Confederate revolutionary war. In doing so, he failed to preserve the Union. In the spring of 1865, former President Abraham Lincoln was put on trial for treason. He was found guilty, and served a life sentence. On July 4, 1876, after complaining of chills and dizziness, Lincoln vomited and collapsed. He was treated, but his health did not improve. As he lay in bed the night before, he began suffocating, and the prison guard summoned his doctor. He died shortly thereafter, most likely due to a stroke.