Niagara’s Freedom Trail honours the thousands of African American slaves that found freedom in Canada. Between 1796 and 1949, the Underground Railroad aided an estimated 40,000 African American slaves in their escape to the more tolerant northern American states, or ultimately to the freedom of Canada. Fort Erie, Ontario became a popular crossing for freedom seekers because of its proximity to Buffalo, New York. Ferry operators aided fugitive slaves and used a secret system of codes and symbols to distinguish bona fide passengers from potential spies.