Conversation so far:
who has the power to initiate all cases of impeachment
The House of Representatives shall choose their Speaker and other Officers; and shall have the sole Power of Impeachment.
can the state impeach federal officials
Each state's legislature can impeach state officials, including the governor, in accordance with their respective federal or state constitution.
what are some reasons for impeachment
Most impeachments have concerned alleged crimes committed while in office, though there have been a few cases in which officials have been impeached and subsequently convicted for prior crimes.
is there a trial held during the impeachment process
Impeachment proceedings unfold in the form of a trial, with the Senate having the right to call witnesses and each side having the right to perform cross-examinations.

Question: what happens after
Self-contained rewrite: what happens after the impeachment senate trial