A. Spanish conquistadors bring their horses with them across the Atlantic. Some horses escape or swim to shore after a ship sinks. The Plains Indians become expert horsemen and buffalo hunters.
This was certainly not intentional since hardly the conquistadors would want their enemies to be stronger.
B. B. Rats are aboard European ships coming to the Americas. The rats spread disease and hunt unknown numbers of smaller animals to extinction.
This is hardly intentional. Rats were almost unavoidable back then and the Europeans just did not care much about them. They weren't thinking about how the rats would cause trouble in the Americas. They were "just rats".
So the only intentional one is:
C. Columbus brought pigs to the Americas on his second voyage. The pigs provided a valuable source of food for a growing population.
Columbus brought pigs for them to serve as food eventually and so they did.
B thousands came seeking their fortune
To qualify as “a sandwich,” a given food product must, structurally, consist of two (2) exterior pieces that are either separate or mostly separate;
Those pieces must be primarily carbohydrate-based—so, made of bread or bread-like products;
The whole assemblage must have a primarily horizontal orientation (so, sitting flush with a plate rather than perpendicular to it); and
The whole assemblage must be fundamentally portable.
So. Under this definition, a burger is a sandwich. So is an ice cream sandwich. So is an Oreo. So is a grilled cheese. But not a hot dog
