Answer:
<h2>open frontier:</h2>
It is undeveloped region that is open to settlement; open border.It means the land or territory that forms the furthest extent of a country's settled or inhabited regions. Often frontiers. the limit of knowledge or the most advanced achievement in a particular field: the frontiers of physics.
<h2>closed frontier:</h2>
In 1890, the Census Bureau broadcast the closure of the frontier, meaning that in the west there was no apparent tracts of land without settlers. This news was a distinguished event in American history; the frontier represented danger because of the Natives who lived in the region but also freedom and opportunity.
Answer:
it was The recession of 1973-1975 in the U.S. came about because of rocketing gas prices caused by OPEC's raising oil prices as well as embargoing oil exports to the U.S. Other major factors included heavy government spending on the Vietnam War, and a Wall Street stock crash in 1973-74.
Explanation:
This research study suffers from an absence of:
<h3>What is a Research Study?</h3>
This refers to the systematic observation of a particular phenomena in order to understand the reason for occurence, the frequency of occurrence and other important questions, using the scientific method.
With this in mind, we can see that because Dr Gutierrez is making a research question examination, then his student tells him that the data cannot be disproven no matter the evidence gathered and this showed that the research study lacks falsifiability.
Read more about research study here;
brainly.com/question/26177190
The main thing that businesses and industries did during this time that caused the economy to slow down was to invest carelessly in business, to the point where they became wildly overvalued--leading to an economic bubble that "burst".
