This country has niagara falls on its northern border
a. canadian shield
b. st. lawrence river
c. arctic circle
d. united states
e. rocky mountains
f. british columbia
g. pulp
h. canada
i. grand banks
j. alberta

The country which has Niagara Fallson its northern border is the d) United States with Canada. It specifically is the border with the Canadian province of Ontario and the state of New York. There are three waterfalls named the Horseshoe Falls, the American Falls and the Bridal Veil Falls.

Correct answer for apex is d.