Final answer:
American troops faced challenges in Vietnam due to guerrilla warfare tactics, difficult terrain, and lack of public support.
Step-by-step explanation:
Out of the options provided, the factor that did NOT contribute to the challenges American troops faced in Vietnam was 4) Superior military technology and firepower. While the United States did possess superior technology and firepower, it did not guarantee victory in the conflict.
The challenges American troops faced in Vietnam were primarily due to:
- Guerrilla warfare tactics used by the Viet Cong, which involved hit and run ambushes and the use of tunnels and bases for supplies and shelter.
- Difficult terrain and dense jungles, which made it hard for American troops to navigate and locate the enemy.
- Lack of public support and anti-war sentiment, which led to a decline in morale among American troops and limited their effectiveness.