Please help me :( this is too hard here:

What were four reasons for the decline of spain as a world power

Which of these innovations led to increased production in american factories in the early 1800s? a. the use of interchangeable parts b. the construction of canals c. the invention of the mechanical reaper d. the availability of electricity

Read this sentence from part 2: gandhi's model of resistance and reform was creative, appealing, and successful. what is the point of this sentence? gandhi created a new model for others. gandhi had a creative mind. gandhi had many supporters. gandhi's model was effective.