The 1787 Constitution of the United States mainly embodies that:

The 1787 Constitution of the United States.

a) Features. 1. The U.S. Constitution is a written constitution.

The United States was the first country in the world to have a written constitution, which was adopted in 1787 and came into effect in 1789.

Among them, it is worth mentioning that the North American Declaration of Independence was regarded by American scholars as a symbol of the process of exploring the continuation of the United States, and it confirmed"Natural human rights"、"The principle of the people's **.

The Articles of Confederation were the first constitutional documents of the United States, and these two historical documents led to the creation of a written constitution in the United States to consolidate the victory of the bourgeoisie.

2. Strong adaptability.

The U.S. Constitution is the longest-running constitution in the world, lasting more than 200 years.

This is because the capitalist private ownership in the United States has never changed, the political situation is relatively stable, there has been no frequent restoration and repeated struggle, and only minor revisions and minor amendments to the Constitution can be applied, and the provisions of the US Constitution have a certain degree of flexibility, and at the same time, the United States has adapted to the changed class power balance through amendments, judicial review, conventions, and other means, so as to adapt to the changes and development of the national conditions of the United States.

b) The basic content of the 1787 Constitution of the United States.

1 The U.S. Constitution affirms certain bourgeois democratic principles.

Including: (1) the principle of separation of powers and checks and balances.

The legislative, executive, and judicial powers are exercised by Congress, **, and the Federal Court respectively, and the separation between these three powers is very obvious, while maintaining a relationship of mutual containment and balance;

2) The finite principle.

It is linked to the principle of the rule of law, that is, the rights of the federal ** are limited by law and cannot exceed the limits prescribed by law;

3) The principle of representation, which is linked to the principle of the people.

The preamble to the federal constitution shows that the American people are the makers of the Constitution, but must govern the country through elected representatives.

2 Some of the anti-democratic elements of the U.S. Constitution.

These include: (1) public recognition of slavery, such as Article 1, Paragraph 2 and Article 9 of the Constitution, which respectively affirms the legality of slavery in the form of law, and makes it clear that the slave trade can continue until 1808;

2) Rash treatment of civil rights.

The Constitution can be said to be a guarantee of civil rights in a certain sense, but the United States after gaining independence did not provide for the fundamental rights of citizens in the Constitution, which the Constitutional Representative explained were already provided for in state laws.

In essence, the Federal Constitution does not recognize the validity of the fundamental rights of citizens stipulated in the laws of the states, and even if they are tacit, the rights enjoyed by citizens vary depending on the provisions of the states.

B Question Analysis: At the beginning of its independence, the United States faced a severe situation, and the Confederacy, as a loose alliance, caused the weakness of state power and the excessive power of the states, which seriously hindered the development of politics, economy, culture and diplomacy. Therefore, it is necessary to strengthen the power of the bourgeoisie and maintain the rule of the bourgeoisie.

Therefore, choose B.

Guarantee democracy in the United States and preserve the rule of the bourgeoisie.