ok i believe that the answers are 1,2 4
The main impact De Soto's expedition was disease.The Native Americans did not have any immunity to European diseases since they had never been in contact with them. The most detrimental of illness was the smallpox. They also were introduced to animals such as horses, war dogs, and pigs.
One of the main powers given to the war industries board after its creation in 1917 was to coordinate the domestic war effort in terms of private production, since this was crucial to supplies enough war supplies.
Answer: They help to clarify what happened in a crime.
Explanation: Witnesses tell the judge and/or jury everything they know about an event. A witness is someone who has <em>relevant information</em> about a crime that had taken place.
Birth is happening at a slower rate than death, resulting in a shrinking population.
