 In about 1870 , the sycamore was introduced into the United States , and was planted in New York and New Jersey . It was later cultivated as a park or street tree in New England and the Mid @-@ Atlantic states . By the early part of the 21st century , it was naturalised in fourteen states ( Connecticut , Delaware , Illinois , Kentucky , Maine , Michigan , North Carolina , New Jersey , New York , Pennsylvania , Rhode Island and Washington , D.C. ) , and in the Canadian provinces of British Columbia , New Brunswick , Nova Scotia and Ontario . The United States Department of Agriculture considers it an invasive species . 
