Why does the Fourteenth Amendment start with
a definition of a citizen?

I think the Fourteenth Amendment has to do with slavery. So, it probably starts out with the definition of a citizen, since before the slaves were Emancipated, they weren't considered citizens. They were property.

Explanation:

c) troops march forward in close formation against newer, more accurate weapons

"globalization has greatly impacted the united states and american citizens. first and foremost, globalization has spread american influence throughout the world. globalization has opened up more markets for the united states, which in effect american companies sell their products worldwide. there has been a rise of multinational corporations and their influence has greatly increased."