How did the agricultural innovations contribute to the start of the industrial revolution

Over the course of the eighteenth century which two european powers were locked in almost continual warfare?

Which of these resulted in an actual slow down or limiting of the u.s. and soviet nuclear arsenals?

Which source would best a historian understand the effect of the great chicago fire on families? a. a biography of a chicago family displaced by the fire b. a letter from a grandmother in new york to her family in chicago c. a newspaper editorial about families who were displaced d. an oral history dictated by an adolescent who fled the fire