What was the general state of relations among European countries in the early 1900s

This article covers worldwide diplomacy and, more generally, the international relations of the major powers from 1814 to 1919. The international relations of minor countries are covered in their own history articles. This era covers the period from the end of the Napoleonic Wars and the Congress of Vienna (1814–15), to the end of the First World War and the Paris Peace Conference. For the previous era see International relations, 1648–1814. For the 1920s and 1930s see International relations (1919–1939).

Explanation:

the  seven  days  battles  were  a series of seven battles over seven  days from june 25 to july 1, 1862, near richmond, virginia,  during  the american civil war. the  seven  days ended with mcclellan's army in relative safety next to the james river, having suffered almost 16,000 casualtiesduring  the retreat.

the steam engine.

the locomotive.

the telephone.

the telegraph.

the internal combustion engine.

the rifle.

ironclad ships.

electricity/light bulb.