Democratic (constitutionalist) President Polk, in his war message to the Democratic 29th Constitutional Congress (elected in accordance with Article I, Section 3 [Clause 1]), claims, “Mexico has passed the boundary of the United States, has invaded our territory and shed American blood upon the American soil.”
Postscript: Congress declared war the next day.
[restored 1/22/2022]
Subsequent Events:
Authority:
Article II, Section 3
ccc-2point0.com/constitution-for-the-united-states
References:
Calvin D. Linton, ed. The Bicentennial Almanac: 200 Years of America, 1776-1976, (Nashville, Tennessee: Thomas Nelson, 1975), 127.