Constitutional republic, Republic
, Federal republic
, and Presidential system
hope this is right
Senators are more vulnerable to defeat than their colleagues in the House <span> because Senate candidates are more evenly matched in spending
Money often became a very decisive factor for political candidates for winning the votes through campaigns and advertisement.
Similar spending means that they wouldn't have enough found to out-perform their competitor, which make the senators more prone to losing.</span>
Its important to use textual evidence that would be able to support that claim used in your essay.
Gunpowder was invented somewhere around 900 in China.
Well, that's basically it... :P