Did Martin Luther King Jr give the "I Have a Dream" speech before, during, or after the Montgomery Bus Boycott?

Need it now explain gorbachev’s policy of glasnost. how did this policy change the soviet union?

The united states economy makes up how much of the worlds economy

15 pt (more than one answer)what are some of the ways businesses increased productivity? -obtained new machinery -obtained new resources -obtained new technologies -found ways to make their workers more efficient