Europe and North America are the only continents that have no territory in the southern hemisphere.
Large parts of Mexico were taken over by the US under the doctrine that it is the manifest destiny of the US to extend its territory across the continent of North America, from sea to shining sea.
north America
Alaska connects to North America through Canada's Yukon Territory
Except for an early skirmish in territory that was claimed by both Mexico and the US, North of the Rio Grande, in Texas; most of the fighting occurred on Mexican soil. The US sent troops over land from the North and by sea to Vera Cruz. America also sent expeditions into the Mexican Southwest and California.
Alaska
North America (all of it)
North America and Europe.
Europe and North America
No. In the most southern country in North America (Panama) none of it reaches to the southern hemisphere.
Spain had the most territory in North America in 1790. However, in the next few decades, it would be the UK and then the US.
The Europeans thought that all of North America was unclaimed territory!