A portico is a porch that leads to a building's entrance or is extended as a colonnade, with a roof structure over a walkway supported by columns or enclosed by walls. This concept was popular in ancient Greece and has influenced many cultures, including the majority of Western cultures.
In Greek and Roman architecture a peristyle is a columned porch or open colonnade in a building. 
A colonnade is a row of columns spaced at regular intervals in classical architecture, similar to a balustrade. They can be used to support a horizontal entablature, an arcade, or a covered walkway, as well as as part of a porch or portico.
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Correct answer:  C. The congress system if set up became a model for the United Nations.
Explanation:
My authority source for choosing answer C is the United Nations itself.  <em>UN Chronicle, </em>the magazine of the United Nations, featured an article titled, "From the Congress of Vienna to Present-Day International Organizations" (December, 2014).  That article asserts points such as these:
- <em>When did the process of international organization start?1 It was not in 1945 nor in 1919. Rather, it was the Congress of Vienna (1814-15) that proved to be the relevant turning point in history, when certain conditions allowed a number of European States to set in motion a series of innovations, inventions and learning processes that shaped the core of what we today refer to as international organizations (IOs).</em>
 - <em>The major innovation at Vienna was the follow-up conference. This new idea resulted in the custom of participating States to convene, upon reaching an agreement, a follow-up conference to assess whether previously agreed-upon decisions and policies had been executed. ... Consequently, since 1815, that innovative idea resulted in an ongoing cycle of conferences dealing with similar and related issues. Apart from continuity, the cycle produced incremental decision-making and path dependency with regard to selected common solutions and efforts.</em>
 
 
        
             
        
        
        
Answer:
It was through the Settlers.
Explanation:
The settlers in the country were the first to start the practice of slavery. They brought with them slaves to the country to help with their farm and daily activities.
The settlers involved in this practice were prevalently from Spain and Portugal. This made some Americans to adopt the practice which eventually led to its evolvement in the colonies. 
 
        
             
        
        
        
Can u type this in English