Country A has a strong central government. The legislative branch is can make laws. The executive branch is led by the Prime Minister and lower ministers. The 45 states rely on the central government for money and support which government is country a using and why

Based on the description provided, it appears that Country A is using a unitary system of government.

A unitary system of government is characterized by a strong central authority that holds most, if not all, of the political power. In this system, the central government has the authority to make and enforce laws throughout the entire country, including the 45 states mentioned. The legislative branch in Country A's system can make laws, indicating a centralized lawmaking process.

The executive branch in a unitary system is typically led by a prime minister, who is appointed or elected by the central government. Lower ministers also assist the prime minister in governing various areas of the country's administration.

Furthermore, the fact that the 45 states rely on the central government for financial support suggests that the central government has significant control over economic matters. This is typical in a unitary system, where the central government usually has the authority to allocate funds and resources to lower levels of government.

Therefore, based on the given information, it can be inferred that Country A is using a unitary system of government, wherein political power is concentrated at the central level, with the legislative branch making laws and the executive branch led by a prime minister and lower ministers.