Why would a war against one country involve many other countries?

Question

Why would a war against one country involve many other countries?

Answer 1

Why not? In the World War it was just a domino effect because each country had a different Ally.

For ex. why do we Canadians fight in Afghanistan because our neighboring friend the USA decided to invade it.

Answer 2

Wars are rarely one country against another, everyone has allies.

Answer 3

Try to chip-in...So, they may get a piece later....Share the wealth kind of.....

Answer 4

For example, when a regime commits acts of genocide against it's people, It is the responsibility of the civilized nations of the world to intervene

Answer 5

It is because of allies. Allies are sort of like friends. They are countries that support another country.

Answer 6

Each country's ALIES