Of all the Ethnic groups in Russia and the Eurasian republics, the B) Slavs are most numerous.
Plantations
The flat land was good for farming and so the landowners built very large farms called plantations. The crops that were grown were called cash crops because they were harvested for the specific purpose of selling to others.
The Kyoto Treaty does not undermine the United States sovereignty because it does not have anything to do with such. It was a treaty that asks committing State parties to reduce greenhouse gas emissions because global warming does exist and it is caused by CO2 productions done by human activities.
The correct answer among all the other choices is C. Advancements in travel and communication allowed this change. This is the statement that does not describe the 20th Amendment. Thank you for posting you question. I hope this answer helped you. Let me know if you need more help.