I think there are many factors as to why the Europeans depended more on enslaved Africans, one you mentioned is epidemics.
When the Europeans brought over disease there was a decrease in the Native American population, on top of that indentured servants were more expensive than African slaves. So when they made Africans Slaves it cost less, and unlike the Native Americans they didn't know the area that well, so they weren't as likely to escape.
I hope that helped answer your question!
The correct answer to this open question is the following.
Although there are no options attached or further references we can say the following.
Rob DeSalle studies genes and DNA. According to him, genes determine how complex living things are in that these genes specifically characterize every single living being on planet Earth.
For Rob DeSalle, the number of genes does not determine if you are a better species than others. Or the wrong idea that if some species have different amounts of genes this means that it has better DNA or is a superior species.
Desalle indicates that some amoebas have more DNA in their cells, compared to humans. For him, the key lies in how the species uses its DNA in order to determine its complex life.
The seasonal gatherings are going to occur in the summer<span />
The main event described in the article is the attack on Pearl Harbor in the World War II. There were multiple causes which led to this event.
1. Americans wanted to stay neutral in the upcoming war, due to the atrocities of the World War I. "Americans remembered the horrors of World War I, which took place from 1914-1918. They hoped to stay out of the problems in Europe this time."
2. The Great Depression influenced the crisis in Europe, and brought Hitler and the Nazis into power. USA wanted to stay isolated from these events and keep their neutrality. "In the 1930s Americans were more worried about their own problems than problems in Europe".
3. In order to help the British, Roosevelt needed to change the legislation but still keep USA neutral. They decided to "lend" weapons and ammunition to their allies in order to help them fight Hitler. "The United States could simply lend Britain weapons to fight the war."
4. United States finally entered the World War II when Japanese attacked the US military ships on Perl Harbor. "Faced with an assault on its own forces, the United States finally entered the World War II."
