John McEwan came to America (and later went to Mexico).

The evidence

• “Milton ; born in Perthshire, Scotland, Oct. 8, 1813 ;. son of William and Elizabeth MoEwan, who had four sous — John, Peter, William and James ; John came to America in 1832 ; went to Mexico, having been engaged by the corporation of the City of Mexico to assist in the introduction of water supply for that city ; was a plumber by trade ; he died with Asiatic cholera there in 1833. Peter left Scotland in 1834, and went to Canada ; came to Rock Co.”

  1879-history-of-rock-county/25-bios-milton.md, PDF p. 821

  Butterfield, C. W., et al. The History of Rock County, Wisconsin: its early settlement, growth, development, resources, etc. Chicago: Western Historical Company, 1879. Cornell University Library via the Internet Archive, archive.org/details/cu31924028871585.

  Grade A: Found on a page of one of our sources