"More than 10,000 Clovis points have been discovered, scattered in 1,500 locations throughout most of North America; Clovis points, or something similar, have turned up as far south as Venezuela. They seem to have materialized suddenly, by archaeological standards, and spread fast. The oldest securely dated points, discovered in Texas, trace back 13,500 years. In a few centuries they show up everywhere from Florida to Montana, from Pennsylvania to Washington State." Source: Smithsonian Magazine (2013)
Notes: The dating of the first appearance of the Clovis Culture varies from source to source, but it's probably safe to say that the Clovis points date back to sometime between 15,000 and 13,000 BC.
The article calls these finds "the last physical traces of America’s first and most extensive cultural imperium," but the idea that Clovis was "America's first culture" is still controversial.
Video below shows Clovis points discovered in Washington State.