Which physical feature is found throughout the yucatán peninsula?

The physical feature that can be found throughout the Yucatan Peninsula are Cenotes. These are caves and sinkholes that were used to access the groundwater  and for sacrificial offerings by the Maya. These features are natural swimming holes. 

It is the doctrine that the us had the right and duty to expand throughout north america. it just means they believed they had the right to expand westward and they did! they stated with the 13 colonies and then they kept moving gaining different territories throughout the years