Answer:
Classroom wall hangings
Explanation:
The independent variable in a research is that variable that the researcher wants to use to find out if it affects the dependable variable. The researcher manipulates the independent variable to see if it brings any change to the dependent variable. In this example, the researchers wants to test if classroom wall hangings can increase GPA, hence he wants to see if manipulating the classroom wall hangings can have an impact on the GPA of students.
In America it began in 1619 and ended with the 13th amendment in 1863 but this was only finalized in the constitution in 1865.
