What are the options available to the president if he dislikes a bill?

By threatening a veto, the President can persuade legislators to alter the content of the bill to be more acceptable to the President. Congress can override a veto by passing the act by a two-thirds vote in both the House and the Senate. (Usually an act is passed with a simple majority.)

Some of the effects of this cross cultural interactions between 600-1450 CE included the Afro Eurasian Trade Network as it facilitated the spread of Islam and technology, the conversion to Islam by civilians as the basis of the religion was equality and the Great Schism which split the church permanently into Catholic and Orthodox churches.