Why was imperialism between European countries a significant cause of WW1?

It was the main cause as all great European powers wanted to spread their imperialistic and colonial power.

Explanation:

After Italy and Germany were unified European political scene was totally different. Old powers felt threatened by the rise of these countries, while on the other side, Germany and Italy, together with Austria-Hungary wanted to strengthen their role.

After the Berlin Conference it was obvious that France and Britain had dominance in the colonies, therefore the so-called Central Powers wanted to rearrange this.

Entente powers didn't wanted to change their stance and it was just a question of time when the world will begin.

first industrial revolution - the first wave of the industrial revolution lasted from the late 1700s to the mid-1800s. it industrialized the manufacture of textiles and began the move of production from homes to factories. steam power and the cotton gin played an important role in this period.