Lots of intelligent halftruths here.
Yes, the "discovery" of America (something of a mystery term) caused horrible suffering, BR. But then, your country wouldn't exist if no European had ever sailed westwards and spread pandemics among Native Americans. If you can't come to term with that relationship, may I advocate suicide?
Yes, Phil, Columbus started the tradition of European conquest and resettlement of the Americas.
Yes, Al, he wasn't
directly involved with events in North America.
The Spanish stopped expanding in North America after about the 1550s, for quite a long time. I guess they had more important gains to consolidate. Except for some mission settlements in Florida and Georgia, and of course for Spanish New Mexico (including parts of modern Texas), they didn't colonize the modern U.S. (although Harry rightly mentions Puerto Rico, and forgets to mention the Virgini Islands.) US colonial history proper begins at Jamestown in 1607, or Roanoke twenty years before for all I care, might conceivably (but not very likely) have happened without Spanish conquests further South, and probably would not have happened without the North Atlantic fishery.
Here's an odd fact: In the late 17th and early 18th century, a third of Carolina's slaves were Native Americans. Large numbers of these were Roman Catholics, from the Florida and Georgia missions, raided by Heathen Indians allied to the British. Thousands of Southeastern US Native Americans were also sold into slavery in the Caribbean.
Early African christianity in North America may have been transmitted largely by these Christian Indian slaves.