From 1960 to 2005, new immigrants and their U.S.-born descendants accounted for 51% of population increase. In the later part of that period, from 1980 to 2005, new immigration accounted for 58% of the 68 million additional people.
1 An escutcheon plate is the disc around a plumbing pipe at the wall penetration that seals the wall opening. The photo above shows a chrome escutcheon plate where the water supply pipe for a toilet enters the wall. You will also find escutcheon plates at the pipe penetrations under sinks and behind water heaters.
If there is a blot on your escutcheon, you have damaged your reputation by doing something wrong. For the leaders, this is probably a blip rather than a blot on the escutcheon. Note: An escutcheon is a shield, especially a heraldic shield displaying a coat of arms.