Since the Emancipation Proclamation was based on the president's war powers, it applied only in territory held by Confederates at the time it was issued. However, the Proclamation became a symbol of the Union's growing commitment to add emancipation to the Union's definition of liberty. The Emancipation Proclamation greatly reduced the Confederacy's hope of being recognized or otherwise aided by Britain or France. By late 1864, Lincoln was playing a leading role in getting the House of Representatives to vote for the Thirteenth Amendment, which mandated the ending of chattel slavery.