The introduction of iodized salt in the 1920s dramatically reduced rates of in the united states.

The introduction of iodized salt in the 1920's dramatically reduced rates of goiter in the United States. This rapidly reduced the incidence of iodine deficiency. The United States and Switzerland were the first two countries to introduce the use of iodized salt to their country. 

i'm not exactly sure if you should be referring to your textbook or other resources for this because they might want it verbatim, but here we go.

7: when martin luther king jr. (january 15, 1929 - april 4, 1968) was growing up, although slavery had been abolished, there was still open segregation in practice, i.e., white only restrooms and coloured restrooms. one famous incident was when on december 1, 1955, rosa parks refused to give up her seat to a white man on a bus. because of this, she was arrested, but eventually freed.

8: he was a man who spoke out to the entire nation about peace and equality, so therefore doing something for your community, or nation, is a way of honoring him because he did the same. everyone learns about martin luther king jr. he is famous in history books, most especially for his “i have a dream” speech that inspired millions worldwide. he spoke to the entire nation about freedom, equality, and peace for all. he was participation in his community and doing what was right for him and all his community. participating in service projects is a great idea to honor his dream and his memory. even thought it’s not was comes first to mind when thinking about community service projects, it is an amazing way to honor an amazing man who changed the future for the better.

hope this ! : )