Why are the borders of some states straight and others crooked

answer:

conflict,physical obstacles

Explanation:

Some borders may be crooked because the surrounding territory might be already claimed or if there is conflict there. Other reasons might be there is a important resource so a country might surround it to benefit an example would be oil. Physical boundaries like a mountains or rivers can also create a crooked boarder.

answer; /// the best answer to the above question is (plants);

this is a good question! i'll do some research and come back when i have the answer!