美联储并没有公布税改，而是美国政府公布了税改政策。

美国税改是指美国政府对税法进行的改革。美国税改主要包括个人所得税和企业所得税的改革。个人所得税改革主要涉及降低税率、扩大税基、简化税制等方面，而企业所得税改革则主要涉及降低税率、鼓励企业投资等方面。

美国政府公布税改政策的原因主要是为了促进经济增长和就业。通过降低个人所得税和企业所得税，可以增加居民的可支配收入和企业利润，从而刺激消费和投资，促进经济增长。此外，税改还可以减少政府的财政赤字，提高政府的财政收入。

需要注意的是，美国税改对不同的人群和行业影响不同。一些低收入人群可能会因为税改而获得更多的税收优惠，而一些高收入人群则可能会面临更高的税率。同时，不同行业的企业也可能会因为税改而获得不同的利益。

此外，美国税改还需要经过国会的审议和批准才能生效。如果国会没有通过税改议案，那么税改政策将无法实施。

总的来说，美国税改是一项复杂的政策，需要考虑到各种因素和利益关系。政府需要平衡不同人群和行业的利益，同时也需要考虑到国家的长期发展。因此，政府需要谨慎制定税改政策，以确保其能够有效地促进经济增长和发展。

英文对比阅读：

The US government has announced tax reform, not the Federal Reserve.

US tax reform refers to the reform of the tax laws carried out by the US government. US tax reform mainly includes the reform of individual income tax and corporate income tax. The reform of individual income tax mainly involves reducing tax rates, expanding the tax base, simplifying the tax system, and so on, while the reform of corporate income tax mainly involves reducing tax rates, encouraging enterprises to invest, and so on.

The reason why the US government announced tax reform is mainly to promote economic growth and employment. By reducing individual income tax and corporate income tax, it can increase residents' disposable income and corporate profits, thereby stimulating consumption and investment, promoting economic growth. In addition, tax reform can also reduce the government's fiscal deficit and increase the government's fiscal revenue.

It should be noted that US tax reform has different impacts on different groups and industries. Some low-income groups may get more tax优惠due to tax reform, while some high-income groups may face higher taxes. At the same time, different industries may also get different benefits due to tax reform.

In addition, US tax reform needs to be reviewed and approved by Congress before it can take effect. If Congress does not pass the tax reform bill, the tax reform policy cannot be implemented.

Overall, US tax reform is a complex policy that needs to take into account various factors and interests. The government needs to balance the interests of different groups and industries, and also needs to consider the country's long-term development. Therefore, the government needs to carefully formulate tax reform policies to ensure that they can effectively promote economic growth and development.