What have been the most dramatic changes in passenger transportation over the centuries?

Explanation:

The invention of the steam ship and especially the railroad. It increased both the speed and amount of goods.

Iron hull steam ships could be made far bigger than any sailing ship, and faster. Even the fastest windjammers would only average 8 knots or so overall, even if they could do burst of speed for 16 to 18 knots, and sailing ship.were always at the mercy of the wind. Steam ships could travel at a steady 6, 8, or even 10 knots or higher and were not at the mercy of the winds. Trains could travel in a day what a horse drawn wagon might take week, and loads of far greater size. For the first time in history, transporting by land became as cheap as by sea.

The airplane, of course, allowing you to reach places in a day what could have taken a week or more.

And the automobile. It changed the structure of cities, allowing one to travel easily 25, 50 miles, even 300 point to point wherever and whenever the driver wanted, not to someone’ else's schedule (train, plane, ship) and destination.

when studying cause and effect, historians usually group the causes into different categories. for example, cultural causes reflect how a society’s literature and art convey the way the society saw itself in relation to the rest of the world. another resource that historians use to understand society is pop culture, which tells them the trends and ideas that are preferred by the common people. when studying cause and effect, it’s important to remember multiple causation, or the idea that an effect could have several causes and vice versa.  

the correct option is “cultural causes” since art and literature are related to the culture of a place. culture is determined by literature, art, music.

the correct option is “pop culture” since it reflects the likes and ideas of common people whereas the rest of the options do not focus on common people.  

the correct option is “multiple causation” since it refers to the idea that events are caused by multiple reasons, not just a single one.  

president carter called the victims of kidnapping "victims of terrorism and anarchy" and added that the united states was not going to give in to blackmail. in the united states, they see hostage-taking as an outrage on the part of the islamist movement that violated the principle of international law on the immunity and inviolability of diplomats and their embassies.

carter refused to yield to the demands, khomeini used the situation to consolidate his power and nullify the challenges of the moderate wing of his government, headed by its president. the euphoria over the humiliation of the most powerful nation distracted the iranian people from the economic difficulties of their country. carter, in april 1980, broke diplomatic relations with iran and imposed a trade embargo, except medicine and food. iranian funds in the us they were frozen and accounted for to compensate the hostages when they were released and to pay the demands of us companies against iran.