The Zollverein was an economic union of 30 states. The correct option among all the options given in the question is option "b". Zollverein is actually a coalition of German states whose main agenda was to manage the tariffs and all the economic policies within the German territories. Later on it expanded to other European countries as well.
<span>The United States becomes the first and only nation to use atomic weaponry during wartime when it drops anatomic bomb on the Japanese city of Hiroshima. Though the dropping of the atomic bomb on Japan marked the end of World War II, many historians argue that it also ignited the Cold War.</span>
<span>On November 4, 1979, a group of Iranian students stormed the U.S. Embassy in Tehran, taking more than 60 American hostages. The immediate cause of this action was President Jimmy Carter’s decision to allow Iran’s deposed Shah, a pro-Western autocrat who had been expelled from his country some months before, to come to the United States for cancer treatment. However, the hostage-taking was about more than the Shah’s medical care: it was a dramatic way for the student revolutionaries to declare a break with Iran’s past and an end to American interference in its affairs. It was also a way to raise the intra- and international profile of the revolution’s leader, the anti-American cleric Ayatollah Ruhollah Khomeini. The students set their hostages free on January 21, 1981, 444 days after the crisis began and just hours after President Ronald Reagan delivered his inaugural address. Many historians believe that hostage crisis cost Jimmy Carter a second term as president</span>
