My favorite food is hamburgers.  Do you like hamburgers? 
I love Hamburgers! I actually like cheeseburgers, but I consider them to be the same thing.
When did people start eating hamburgers? 
Not too long ago, the Hamburger appeared around the 19th or early 20th century. 
Was it born in Germany or America? 
That's a topic of large debate. The meat portion came from Germany, but most Americans say they were the first to put the meat between the slices of bread.
When did hamburgers become mass produced? 
I'm actually not sure, but it became mass-produced when the working and middle class wanted affordable food outside of the home.
After that happened it became proliferated around the world. 
Yep, they're sold at all types of restaurants--fast food chains, fancy restaurants, and even diners. I could use a hamburger right now!