Why did european nations form alliances in the early 1900s? they were unsure they could protect themselves if attacked by larger nations.
they wanted more colonies in africa and asia.
they wanted to join with others who shared their culture and religion.
they wanted to form groups that made trade easier.

I believe the answer is: They were unsure they could protect themselves if attacked by larger nations.

When several nations formed an alliance, they tend to agree to combine their millitary forces and would back each other up in case they are facing an attack from other countries that do not belong in their alliance. This would provide better protection for smaller nations that have no chance in handling larger nations by themselves.

the federal constitution of the united mexican states of 1824 was enacted on october 4 of 1824, after the overthrow of the mexican empire of agustin de iturbide. in the new constitution, the republic took the name of of united mexican states. it was replaced by the federal constitution of the united mexican states in 1857.

not all were fit for battle and were weak.