<em>The muckraker that influenced regulation of the meatpacking industry is Upton Sinclair.
</em>
<u>Explanation:</u>
<em>Upton Sinclair is an famous American writer.</em> He wrote over 100 books but in the book The Jungle he has mentioned about the meat packing facilities. He mentioned the <em>ill behaviour of packing the rotten and bad meats that shocked the public. </em>
His statement of the diseased meat packing system led to the establishment of federal food safety laws. <em>Even a major reform movement was initiated in the United States. </em>
They lost hundreds of soldiers including several officers. This gave the Americans the courage and confidence that they could stand up to the British in battle. Many more colonists joined the army after this battle and the revolution continued to grow in strength.