south America
The connection between Central America and North America is by an isthmus, not an another continent.
United States of America
North America
South America
North America connects to South America on the north side of South America, nothing connects below
South America
North America is in the western hemisphere but not in the southern hemisphere
Central America is a part of the North American continent. The Isthmus of Panama is defined as the border between the continents of North and South America.
The continent of Antarctica is in the southern hemisphere: the Americas are half in the southern hemisphere -- South America, and half in the northern hemisphere -- North America. The polar region north of North America is the Arctic -- an ocean, not a continent.
The closest place to the southern US border is Mexico, which happens to be in North America, just like the US is. The continent that borders North America is South America.
Arkansas is not a continent, it is a state in the southern, central part of the United States. The United States is a part of the continent, North America.
Central AmericaBelize is found in the subcontinent of Central America. Central America is the southernmost, isthmian portion of the North American continent, which connects with South America on the southeast.