<u>Answer:</u>
<em>Contagious diffusion</em>
<u>Explanation:</u>
As the definition suggests, Contagious diffusion is the rapid invasive diffusion of a trait through the same culture.
<em>Contagious diffusion is proportion to the effect called local distance effect.</em>
It is the process of spread of a disease or religious beliefs or values in a culture starting from a fixed place or point which is usually a origin source to several persons.
<em>Contagious diffusion mapping method is used in order to take preventive actions to identify more risky area and take actions effectively.</em>
Answer:
it's not know why
Explanation:
Due to slavery.
Due to African Americans joining the war.
Due to segregated units in the war.
