How did the introduction of steamships affect transporting goods on rivers?

What is the difference between emigrate and immigrate? ?

Which of the following statements is most likely a characteristic of an authoritarian government in africa

If u make mistakes on a school trip to knotts like standing up on a ride too early and they ask you not to do it again or and if you do it again you will be escorted out will it go on my student record? yes i know it is a dumb question