Most of the contiguous united states falls between wich two lines of latitude?

The line of 49N is the boundary between the US and Canada from Minnesota to the Pacific. The border between the US and Mexico is quite jagged, but the word "most" allows me to set the approximate southern latitude somewhere between 31N (the Arizona/New Mexico southern border) and 26N (the southern tip of Texas at Brownsville). Call it 29N.

So, "most" of the "Lower 48" is between 29N and 49N.
The line of 49N is the boundary between the US and Canada from Minnesota to the Pacific. The border between the US and Mexico is quite jagged, but the word "most" allows me to set the approximate southern latitude somewhere between 31N (the Arizona/New Mexico southern border) and 26N (the southern tip of Texas at Brownsville). Call it 29N.

So, "most" of the "Lower 48" is between 29N and 49N.