If you are considering the research paper but are unsure about a topic, here are some ideas that would be perfectly suitable --- and maybe enjoyable! --- for you to research.
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Industrial Revolution
Eli Whitney and the making of the Cotton Gin
Cultural:
History of Baseball
History of Thanksgiving
Violence/Fighting in the Colonies
Gender Roles
Appalachia
"Uncle Sam" Wilson
Mathew Brady (Civil War era photographer)
Manifest Destiny
Fort Pitt Smallpox epidemic
John Peter Zenger & censorship
Walt Whitman
Louisa May Alcott
Edgar Allen Poe
Ralph Waldo Emerson
Phillis Wheatley
Philosophers & Explorers:
Lewis and Clark; Sacagawea
Hernando Cortes & Malinche
Treaty of Tordesillas
Exploration of the desert southwest
Lost Colony of Roanoke, NC
John Locke
Alexis de Tocqueville
John O'Sullivan (coined phrase "manifest destiny")
Immigration and Race:
Irish Immigration to the US after the Potato Famine of 1845
Thomas Jefferson & Sally Hemings
La Amistad
Trail of Tears
Ku Klux Klan
Bacon's Rebellion
Stono Rebellion
NYC Draft Riots in 1863
Indian Removal Act & Andrew Jackson
Any President or First Lady
Duel between Aaron Burr & Alexander Hamilton
Any political party
Alien & Sedition Acts
Missouri Compromise
Bleeding Kansas
Supreme Court
Louisiana Purchase
Seward's Folly (purchase of Alaska)
The Confederacy & Cuba
Deaths of Thomas Jefferson & John Adams (died on same day)
Benedict Arnold
George III of England (insanity)
Religion:
Any of the explorers of the New World
Witchcraft & polytheism, as practiced by Native Americans & enslaved Africans
Puritans
Quakers
Shakers
Unitarians (or any other religion)
Great Awakening
Second Great Awakening
Women's Issues:
Rachel Donelson Robards Jackson (divorcee who married Andrew)
Mary Todd Lincoln (wife of Abraham)
Abigail Adams (wife of John)
Childbirth and Pregnancy
Birth Control Methods
Lucretia Mott
Elizabeth Blackwell
Susan B. Anthony
Angela & Sarah Grimke
Florence Nightingale
Margaret Fuller
Lucy Stone
Frances Willard
Elizabeth Cady Stanton
Abigail Adams
Clara Barton
Women soldiers during any conflict