Why did Austria-Hungary declare war on Serbia? How did the political climate of Europe at the time help contribute to the escalation of this conflict into a "Great War"?

Great War.

Explanation:

Austria-Hungary declares war on Serbia after the assassination of Ferdinand and his wife.

The assassination is generally thought to be one of the major events that led to the war in Europe. The Austria-Hungary government blamed the Serbians, believing to have helped the Bosnian terrorists in killing. Serbia supported by the Russians, and the Austria- Hungary government along with the Germans declared war on Serbia. All this led to the beginning of World War I in Europe that extended and formed two sides, the Central Powers and Allies.

in november 1781, john hanson became the first president of the united states in congress assembled, under the articles of confederation. many people have argued that john hanson, and not george washington, was the first president of the united states, but this is not quite true.

explanation:

the underground railroad (apocope of the metropolitan railroad) is a system of urban trains located within a city and its metropolitan area. it is characterized for being a massive transport of passengers in the big cities, uniting diverse zones and their environs, with high capacity and frequency and in segregated form to other systems of transport. metropolitan railroads are built underground or on the surface, although most systems use mixed models where sections are combined in both modalities.

1 - as a result, the metro tends to reduce car travel for two reasons: first, due to the greater transfer of users from the car and, second, due to the reduction in the acquisition of cars in homes located in sectors near the stations of the metro.

2 -the metro allows to contribute effectively to the achievement of all the objectives of an urban development policy: it improves the efficiency of the city's economy by reducing travel costs and also generates a higher level of activities in the city center, taking advantage of of the agglomeration economies.

3 -it is a clean means of transport, since it uses renewable energy (usually electricity), taking care of the environment and avoiding excessive pollution.