The main goal of writings published by marcus garvey and the unia was to

Promote pride in African heritage.

Explanation:

Marcus Garvey and his organization, the Universal Negro Improvement Association (UNIA), wanted to promote pride in African heritage. The organization was the largest mass movement in African American history, and it was present in all major cities in the United States. The organization promoted a nationalist approach, in which African Americans were encouraged to go "back to Africa" to celebrate their roots and recover their heritage.

postards have pictures on them, these pictures are things that may never be seen again. the pictures are a part of our history that shows things. because of this many collectors would pay a lot of money for them.

i read on google they "offer a glimpse into the past"

hope this : )

can you post the story