Will give brainlist The primary motivation behind the creation of alliances in Europe in the late 1800s was to

support each other in times of war.
protect each other from economic collapse.
help each other colonize other countries.
encourage each other to expand their militaries.

Support each other in times of war.

Explanation:

Major alliances were being made in Europe during the 19th century (1800s) due to expansion of territories and major countries appearing on the map. For example the Crimea War of 1853 has multiple major powers fighting each other. Russian Empire against Ottoman Empire, France, British Empire and Austrian Empire. Another example was is The Second Schleswig War of 1864 with Denmark against Prussia (Germany) and Austrian Empire. The alliances supported each other during these wars to take down a common enemy.