Gold Trade and the Kingdom of Ancient Ghana
<span>Around the fifth century, thanks to the availability of the camel, Berber-speaking people began crossing the Sahara Desert. From the eighth century onward, annual trade caravans followed routes later described by Arabic authors with minute attention to detail. Gold, sought from the western and central Sudan, was the main commodity of the trans-Saharan trade. The traffic in gold was spurred by the demand for and supply of coinage. The rise of the </span>Soninke empire of Ghana<span> appears to be related to the beginnings of the trans-Saharan gold trade in the fifth century.
Hope this helps!</span>
Option A
Mercantilism. Mercantilism is economic nationalism for the purpose of building a wealthy and powerful state. Adam Smith coined the term “mercantile system” to describe the system of political economy that sought to enrich the country by restraining imports and encouraging exports
Answer:
I'm pretty sure that's the federal power
During the debates on the adoption of the Constitution, its opponents repeatedly charged that the Constitution as drafted would open the way to tyranny by the central government. Fresh in their minds was the memory of the British violation of civil rights before and during the Revolution. They demanded a "bill of rights" that would spell out the immunities of individual citizens. Several state conventions in their formal ratification of the Constitution asked for such amendments; others ratified the Constitution with the understanding that the amendments would be offered.
On September 25, 1789, the First Congress of the United States therefore proposed to the state legislatures 12 amendments to the Constitution that met arguments most frequently advanced against it. The first two proposed amendments, which concerned the number of constituents for each Representative and the compensation of Congressmen, were not ratified. Articles 3 to 12, however, ratified by three-fourths of the state legislatures, constitute the first 10 amendments of the Constitution, known as the Bill of Rights.
Biplanes (and triplanes) became (nearly) extinct not because high strength materials (like composites) were not available, but because they became available.
One of the major reasons for use of biplanes in the early days of aviation was that the materials available were of insufficient strength for the (wing) designs used.
The major disadvantage of biplanes (or triplanes) is aerodynamic- it produces a lot of drag compared to the monoplane and the wings interfere with each other.
So, the biplane was an (aerodynamically) inefficient solution to a structural problem. As higher strength materials like Aluminum became widespread, the biplanes fell out of favor.
While they <em>can</em> be revived, I don't see why someone would do that, except for nostalgia (or some special uses, like aerobatics).
There are some companies who manufacture or restore biplanes, but they usually don't use (modern materials like) composites, though modern avionics are used.