Which sentence best shows correct comma usage? Mexico has a lot in common with the United States, the country to its north. Mexi
co, has a lot in common, with the United States the country to its north. Mexico has a lot in common, with the United States, the country to its north. Mexico, has a lot in common with the United States, the country to its north.
"His or her" would technically be the best fit, since it is acknowledging both genders, but it is very common to use "their" any most people wouldn't consider it wrong. <span />
