How did the U. S. Constitution solve a problem created by the Articles of Confederation? The Constitution created a bicameral legislature, allowing each state two ways of passing laws.
The Constitution created a national military, where defense would not depend on donations from the states.
The Constitution created a Congress, where each state would have one elected official to represent it.
The Constitution created an executive branch, allowing each state to lobby the president for vetoes.

B. The Constitution created a national military l, where defense would not depend on donations from the states.

Explanation:

In 1786, Virginia and Maryland invited delegates from the other eleven states to meet in Annapolis, Maryland, revising the Articles of Confederation. However, only five states sent representatives. Because all thirteen states had to agree to any alteration of the Articles, the convention in Annapolis could not accomplish its goal. Two of the delegates, Alexander Hamilton and James Madison, requested that all states send delegates to a convention in Philadelphia the following year to attempt once again to revise the Articles of Confederation. All the states except Rhode Island chose delegates to send to the meeting, a total of seventy men in all, but many did not attend. Among those not in attendance were John Adams and Thomas Jefferson, both of whom were overseas representing the country as diplomats. Because the shortcomings of the Articles of Confederation proved impossible to overcome, the convention that met in Philadelphia in 1787 decided to create an entirely new government. Fifty-five delegates arrived in Philadelphia in May 1787 for the meeting that became known as the Constitutional Convention. Many wanted to strengthen the role and authority of the national government but feared creating a central government that was too powerful. They wished to preserve state autonomy, although not to a degree that prevented the states from working together collectively or made them entirely independent of the will of the national government. While seeking to protect the rights of individuals from government abuse, they nevertheless wished to create a society in which concerns for law and order did not give way in the face of demands for individual liberty. They wished to give political rights to all free men but also feared mob rule, which many felt would have been the result of Shays’ Rebellion had it succeeded. Delegates from small states did not want their interests pushed aside by delegations from more populous states like Virginia. And everyone was concerned about slavery. Representatives from southern states worried that delegates from states where it had been or was being abolished might try to outlaw the institution. Those who favored a nation free of the influence of slavery feared that southerners might attempt to make it a permanent part of American society. The only decision that all could agree on was the election of George Washington, the former commander of the Continental Army and hero of the American Revolution, as the president of the convention.

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the underground railroad (apocope of the metropolitan railroad) is a system of urban trains located within a city and its metropolitan area. it is characterized for being a massive transport of passengers in the big cities, uniting diverse zones and their environs, with high capacity and frequency and in segregated form to other systems of transport. metropolitan railroads are built underground or on the surface, although most systems use mixed models where sections are combined in both modalities.

1 - as a result, the metro tends to reduce car travel for two reasons: first, due to the greater transfer of users from the car and, second, due to the reduction in the acquisition of cars in homes located in sectors near the stations of the metro.

2 -the metro allows to contribute effectively to the achievement of all the objectives of an urban development policy: it improves the efficiency of the city's economy by reducing travel costs and also generates a higher level of activities in the city center, taking advantage of of the agglomeration economies.

3 -it is a clean means of transport, since it uses renewable energy (usually electricity), taking care of the environment and avoiding excessive pollution.