The south vietnamese people were not sure they even wanted to fight against communist north vietnam, because their own leader, ngo dinh diem

in 1862, president lincoln's emancipation proclamation opened the door for african americans to enlist in the union army. although many had wanted to join the war effort earlier, they were prohibited from enlisting by a federal law dating back to 1792.

explanation:

i believe it would influence their own way of understanding things. it shall be a foundation where they can draw or start an argument.   historians are also  scientists that  have their tools of analysis and expertise to unlock a variety of difficulties such as relationships of man, origin, politics, economy, and culture. based on facts and understanding on these areas, they may shade light to extract ideas and develop options to validate a hypothesis or debunk it.

to tell the truth it is a mix of the a and d because after the romans argued among themselves outside forces took control however it is mostly d.

the answer is c. brainliest me