Here is a gift from Ben Franklin to the continent of North America, Sapium sebiferum in the family euphorbiaceae:
According to the USDA this tree was introduced by none other than the 100 dollar man himself in 1776. This photo was taken 234 years later on the 1st of June in 2010. This particular invader is flourishing in my front yard. This tree has a marvelous scent from mid May and into early June and displays beautiful fall colors.