Explain the reasoning behind having so many steps for making a law?

its a complex situation and multiple people have to make a vote on it and it can take awhile

d) the constitution rights of native americans and their right to self-government on reservations

2. a land bridge connected asia and north america thousands of years ago.

4. crossing the land bridge would have been simple for the first migrants.

5. people might have crossed a land bridge while hunting animals.