Where are North America’s tallest buildings located? And which country and/or state has the most?

Where are North America’s tallest buildings located? And which country and/or state has the most?
Percentage of times democrats or republicans have won the presidential election per state.
This map shows how much the population of each state is concentrated in its largest metropolitan area. The state with the highest percentage living in
The areas in the US where the share of population aged under 35 or over 65 is the highest.
Location of the 50 best universities in the US.