Hello, I'm Beatrix may you please help me? Which source is the most credible for researching the positive effects of the Columbian Exchange?

an article on a wiki website
a magazine published in 1988
a .gov website updated in 2019
a blog by a company that sells a product

Which is the best conclusion that can be drawn regarding the status of african-americans in the south in the late 1800s? a) african-americans made tremendous political, social, and economic advancements during the reconstruction era. b) passage of the 13th, 14th, and 15th amendments to the u.s. constitution guaranteed equal status and rights for all african-americans. c) the reconstruction policies enacted by the federal government were highly effective in african-american citizens transition to life after slavery. d) although african-americans had equal rights under federal law they were still economically, politically, and socially inferior to whites in the south during the reconstruction era.