That, as you well know is a matter of opinion. Who invaded Southern Soil? The South didn't invade the North until much later.
Fire ants invaded Southern soil and I hope they do not continue their march northward :)
"The South didn't invade the North until much later."
Everyone knows it was the heat & humidity which slowed Lee down his real plan on conquering the wild ,untamed north woods of Maine. Look it up, I am not sure where though :)