Did Europeans Discover North America Before Columbus?

This article, written in 2007 (probably by Peter N. Jones), briefly discusses the question of Europeans discovering the Americas before Columbus. Concerning the Solutrean hypothesis, the article said

Originally proposed by Frank Hibben in 1941, the Solutrean hypothesis is based on leaf-shaped bifaces and the remains of extinct fauna recovered in the deepest culture-bearing stratum of Sandia Cave, New Mexico. Hibben noted that the flaking technology of the Sandia artifacts more closely resembled the Solutrean technology of Paleolithic era France than Clovis era fluted points from North America. The Solutrean hypothesis, as a result of this cursory evidence, postulates that Upper Palaeolithic peoples from Europe utilizing Solutrean lithic technology migrated into the Americas during the late Pleistocene (18,000-13,000 years ago), most likely along the partially frozen North Atlantic. Evidence supporting such an argument, however, has remained elusive and highly controversial, primarily because the Solutrean ended in Europe at least 5,000 years before the first recognized lithic technology has been conclusively dated for the Americas.

In its concluding paragraph, the article said

So did Europeans discover the Americas before Columbus? The evidence says yes. Did they migrate to, or settle, the Americas prior to Columbus’ modern-day colonial discovery? The evidence says no. The only people who migrated to, and settled, the Americas before the modern European colonial period were the ancestors of today’s American Indian, Alaskan Native, and First Nation peoples.