The study of how ideas developed over time is a type of conceptual or psychological historical research. identify a key concept in your own discipline and describe in detail the types of primary sources you could use to understand its history, explaining what each source might add to the study.

The changes to agriculture in the united states since 1900 is that increased mechanization has increased food production, thereby increasing the need for labor. there has been an increased need for higher speeds of food production due the fact that the population in the united states continues to rise.

A- slaverythe civil war was fought to prevent the expansion of slavery, not the abolotion of it

The correct answer is c and edue to the facts: nobles were completely eliminated as well as the third estate which was the city dwellers or the bourgeois. the idea was that commoners should rule and after the king was removed from power as well as the nobles and the church, people started coming from all over the world to negotiate with this new governments rule.