Why might a divided government make it difficult for Congress to get anything done?

Need on these last 2 questions on my social studies homework 5 and 6 then i’m done with the homework

Iam gonna fail this class ! in 2001 mexico imposed a 20% tax on all soft drinks not made from sugar cane high fractals corn sit-up which is made from corn,is often used in place of cane sugar to manufacture soft drinks. which nation would most likely be impacted by mexico’s policy change?

Which battle was one of the most devastating for