Single/multi-select question: Does the sentence "This explanation is more likely, because President Polk's call for 2,600 nationwide volunteers at the beginning of the Mexican-American War resulted in 30,000 volunteers from Tennessee alone, largely in response to the death of Davy Crockett and appeals by former Tennessee Governor and now Texas politician, Sam Houston." provide a valid answer to the question "What conflict overseen by President Polk might be the source of Tennessee's nickname?"
Available choices:
1). yes;
2). no;
2).