Answer:
The immediate cause of World War I that made the aforementioned items come into play (alliances, imperialism, militarism, nationalism) was the assassination of Archduke Franz Ferdinand of Austria-Hungary. In June 1914, a Serbian-nationalist terrorist group called the Black Hand sent groups to assassinate the Archduke.
Brown v. Board of Education was a landmark case in which it was finally proven that segregation in institutions of education was highly unconstitutional, so you could say that that is the greatest effect since it made other schools become open for everyone as well.
The best answer to the question that is being presented above would be the Ordovician mass extinction. <span>Jawless fish and ocean reefs were devastated by the end of the Ordovician mass extinction. </span>
El Greco slipped his own portait into one of his paintings.
