The Articles of Confederation were far too weak to meet the needs of the newly created United States because of the massive decentralization the Articles contained.
They did not give the government any right to tax the people, and had to ask the states for taxes, and the states were not keen to pay them unless it benefited them. Often found were states not contributing to the pay of the Continental Army because it was not in their territory and defending them. This was also the reason Valley Forge was a disastrous winter for the Continental Army.
The Constitution fixed this by mandating budgets and making sure the states did in fact pay dues to the Gov't, later amended with (the supposed temporary) Federal income tax, starting after The Great War.
The other big failure is the lack of a requirement delegates be there, and the fact it requires every state to vote yes, an amendment to let the Confederation place import taxes to help pay the army was a washed failure because Rhode Island feared having their economy impacted horribly as they were so small they only had trade.
The New Constitution fixed this by making it so 3/4 of the states had to vote Aye to an amendment to the Constitution itself, and made the Federal Government itself handle passes legislation at it's own level with a majority rules, rather than all.
A four episode series from Extra History delve with a good amount of detail as to the Articles' other short comings, and what I elaborated on. Would strongly recommend a watch: https://youtu.be/C6rHSiN0vKk
From the graph that we have here, the event that is responsible for this change is A product becomes less popular and fewer customers purchase it.
The reason this is the answer is because when e look at the graph closely, we can see that only demand fell from 50 to 40. There was no change in price, it remained at 15 dollars.
A fall in demand even at the same price that a good was sold previously shows us that less people are buying the product. This could be due to changing consumer preference.
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Austria felt that Serbia was overreaching its territorial boundaries and that the only way to forestall it was a preventive war. The death of Ferdinand provided a convenient excuse to go to war with Serbia. In support of Serbia, Russia mobilized its forces against Austria-Hungary, who had declared war on Serbia. Germany declared war on Russia. The United Kingdom and France, allies of Russia, also entered the conflict.
A web of alliances existed between many European countries. Austria allied with Germany, and Serbia allied with Russia. The alliances obligated each country to go to war on behalf of its allies. This dragged more and more countries into the war. The war pitted the Central Powers, consisting of Germany, Austria-Hungary, the Ottoman Empire and Bulgaria, against the Allied Powers, consisting of the United Kingdom, France, Russia and Italy. The United States ultimately entered the war on the Allied side.
The correct goverment is the last option