Why does imperialism happen?

The event shown in the map is a cause of which of the following? *pic* gadsden purchase battle of the alamo bear flag revolt settlement of texas

Marcel is nearing graduation. he just met with his counselor and she showed him this information. marcel's college costs & payment options per year costs methods of payment tuition & fees grants & scholarships $12,500 $6,500 room & board work-study $8,200 $9,800 if he pays the balance with a student loan, how much will he need to borrow for his first year? $4,400 $6,000 $10,900 $14,200

Which country joined the allies because it was a rival of germany?