Jacques Marquette was honored on the one-cent stamp of the Trans-Mississippi Exposition Issue. The vignette shows him on the Mississippi , though when he crossed Lake Superior in spring 1674 his wintering cabin was on the site which would become Chicago. Haimann, Alexander T., "1-cent Marquette on the Mississippi, Arago: people, postage & the post, National Postal Museum. Viewed March 22, 2014.   220px|<center>Antoine de la Mothe Cadillac1951 issue 220px|<center>Jacques Marquette, Mississippi River1898 issue  210px|<center>Jean Nicolet, Wisconsin1934 issue Early American explorers of the west include Daniel Boone  . 210px|<center>Daniel Boone , Virginia, Kentucky1968 issue Daniel Boone was honored with a 6-cent stamp in the American Folklore Series, issued on September 26, 1968, at Frankfort, Kentucky, where he was buried. He was a famous frontiersman in the development of Virginia, Kentucky and the trans-Appalachian west. A wall of roughly-hewn boards display the tools of Boone's trade—a Pennsylvania rifle, a powder horn, and a knife. The pipe tomahawk represents that the Shawnees had adopted Boone. His name and birth date was carved on the wall."1968 American Folklore Issue", Arago: people, postage & the post, National Postal Museum online, viewed March 16, 2014. Later American explorers include Lewis and Clark, John C. Frémont and John Wesley Powell. Captain Meriwether Lewis and Lieutenant William Clark commanded the Corps of Discovery to map the Pacific Northwest. They were honored with a 3-cent stamp July 24, 1954 on the 150th anniversary. The 1803 Louisiana Purchase doubled the size of the United States Lewis and Clark, described and sketched its flora and fauna and described the native inhabitants they encountered before returning to St. Louis in 1806.Piazza, Daniel,"Lewis & Clark Expedition Issue", Arago: people, postage & the post, National Postal Museum. Viewed March 22, 2014.  &    Captain John C. Frémont was honored on the 5-cent stamp of the Trans-Mississippi Exposition Issue. He was pictured in a vignette placing the United States flag on a peak in the Rocky Mountains at the age of thirty in 1843. Founder of the Republican Party and presidential candidate in 1856, he was a Union general and Senator from California. A California Gold Rush millionaire, he lost most of his fortune in bad business investments.Brody, Roger S., and Alexander T. Haimann,"5-cent Fremont on the Rocky Mountains", Arago: people, postage & the post, National Postal Museum. Viewed March 22, 2014. 220px|<center> Lewis and Clark Expedition1954 issue 220px|<center> John C. Frémont, Rockies1898 issue 220px|<center>John Wesley Powell, Green and Colorado Rivers1968 issue The Lewis and Clark expedition was celebrated on May 14, 2004, the 200th anniversary of its outset depicting the two on a hilltop outlook. Two companion 37-cent stamps showed portraits of Meriwether Lewis and William Clark. A special 32-page booklet accompanied the issue in eleven cities along the route taken by the Corps of Discovery. An image of the stamp can be found on Arago online at the link in the footnote."Bicentennial Lewis Clark Expedition Issue", Arago: people, postage%DIFDELCMD < & %%% the post, National Postal Museum online, viewed April 28, 2014. An image of the stamp can be seen at Arago online, 37c Lewis and Clark on Hill stamp. 140px|<center>Richard E. Byrd, Antarctica1933 issue Late American explorers included Richard Byrd. The United States maintains research facilities in Antarctica without making territorial claims there, along with other international bases there.%DIFDELCMD < %DIFDELCMD < %%% Richard E. Byrd's Byrd Antarctic Expedition II was commemorated on a 3-cent stamp the same size and shape as Special Delivery on September 22, 1933. Intended for the collectors' market alone, the 'philatelic mail' with this stamp was carried by the expedition and postmarked at the Little America post office, the expedition's base camp.Lawson, Mary H.,"Byrd Antarctic Issue", Arago: people, postage the post, National Postal Museum. Viewed March 22, 2014.
Jacques Marquette was honored on the one-cent stamp of the Trans-Mississippi Exposition Issue. The vignette shows him on the Mississippi River, Haimann, Alexander T., "1-cent Marquette on the Mississippi, Arago: people, postage & the post, National Postal Museum. Viewed March 22, 2014. which he and Louis Jolliet explored (from the Wisconsin River downstream to the Arkansas River) in 1673. Marquette was also honored on a 6-cent stamp, issued September 20, 1968, at Sault Sainte Marie, Michigan, where he established in 1668 the oldest permanent settlement in that state."Father Marquette Issue", Arago: people, postage the post, National Postal Museum. Viewed September 4, 2019. 220px|<center>Antoine de la Mothe Cadillac, Detroit1951 issue 220px|<center>Jacques Marquette, Mississippi River1898 issue 220px|<center>Jacques Marquette, Sault Ste. Marie1968 issue 210px|<center>Jean Nicolet, Wisconsin1934 issue Early American explorers include Daniel Boone , Lewis and Clark . Daniel Boone was honored with a 6-cent stamp in the American Folklore Series, issued on September 26, 1968, at Frankfort, Kentucky, where he was buried. He was a famous frontiersman in the development of Virginia, Kentucky and the trans-Appalachian west. A wall of roughly-hewn boards display the tools of Boone's trade—a Pennsylvania rifle, a powder horn, and a knife. The pipe tomahawk represents that the Shawnees had adopted Boone. His name and birth date was carved on the wall."1968 American Folklore Issue", Arago: people, postage & the post, National Postal Museum online, viewed March 16, 2014. Captain Meriwether Lewis and Lieutenant William Clark commanded the Corps of Discovery to map the Pacific Northwest. They were honored with a 3-cent stamp July 24, 1954 on the 150th anniversary. The 1803 Louisiana Purchase doubled the size of the United States Lewis and Clark, described and sketched its flora and fauna and described the native inhabitants they encountered before returning to St. Louis in 1806.Piazza, Daniel,"Lewis & Clark Expedition Issue", Arago: people, postage & the post, National Postal Museum. Viewed March 22, 2014. 210px|<center>Daniel Boone, Virginia, Kentucky1968 issue 220px|<center>Lewis and Clark Expedition1954 issue The Lewis and Clark expedition was also celebrated on May 14, 2004, the 200th anniversary of its outset depicting the two on a hilltop outlook. Two companion 37-cent stamps showed portraits of Meriwether Lewis and William Clark. A special 32-page booklet accompanied the issue in eleven cities along the route taken by the Corps of Discovery. An image of the stamp can be found on Arago online at the link in the footnote."Bicentennial Lewis& Clark Expedition Issue", Arago: people, postage the post, National Postal Museum online, viewed April 28, 2014. An image of the stamp can be seen at Arago online, 37c Lewis and Clark on Hill stamp. Later American explorers include Lewis and Clark, John C. Frémont and John Wesley Powell. Captain John C. Frémont was honored on the 5-cent stamp of the Trans-Mississippi Exposition Issue. He was pictured in a vignette placing the United States flag on a peak in the Rocky Mountains at the age of thirty in 1843. Founder of the Republican Party and presidential candidate in 1856, he was a Union general and Senator from California. A California Gold Rush millionaire, he lost most of his fortune in bad business investments.Brody, Roger S., and Alexander T. Haimann,"5-cent Fremont on the Rocky Mountains", Arago: people, postage & the post, National Postal Museum. Viewed March 22, 2014. 220px|<center> John C. Frémont, Rockies1898 issue 220px|<center>John Wesley Powell, Green and Colorado Rivers1968 issue %DIFDELCMD < & %%% %DIFDELCMD < %DIFDELCMD < %%% 
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, though when he crossed Lake Superior in spring 1674 his wintering cabin was on the site which would become Chicago.
River,
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which he and Louis Jolliet explored (from the Wisconsin River downstream to the Arkansas River) in 1673. Marquette was also honored on a 6-cent stamp, issued September 20, 1968, at Sault Sainte Marie, Michigan, where he established in 1668 the oldest permanent settlement in that state."Father Marquette Issue", Arago: people, postage
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the post, National Postal Museum. Viewed September 4, 2019.
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Cadillac1951
Cadillac, Detroit1951
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220px|<center>Jacques Marquette, Sault Ste. Marie1968 issue
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of the west
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, Lewis and Clark
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210px|<center>Daniel Boone , Virginia, Kentucky1968 issue Daniel Boone
Daniel Boone
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Later American explorers include Lewis and Clark, John C. Frémont and John Wesley Powell.
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210px|<center>Daniel Boone, Virginia, Kentucky1968 issue 220px|<center>Lewis and Clark Expedition1954 issue
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The Lewis and Clark expedition was also celebrated on May 14, 2004, the 200th anniversary of its outset depicting the two on a hilltop outlook. Two companion 37-cent stamps showed portraits of Meriwether Lewis and William Clark. A special 32-page booklet accompanied the issue in eleven cities along the route taken by the Corps of Discovery. An image of the stamp can be found on Arago online at the link in the footnote."Bicentennial Lewis
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Clark Expedition Issue", Arago: people, postage
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the post, National Postal Museum online, viewed April 28, 2014. An image of the stamp can be seen at Arago online, 37c Lewis and Clark on Hill stamp.
A
Later American explorers include Lewis and Clark, John C. Frémont and John Wesley Powell.
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Lewis and Clark Expedition1954 issue 220px|<center>
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The Lewis and Clark expedition was celebrated on May 14, 2004, the 200th anniversary of its outset depicting the two on a hilltop outlook. Two companion 37-cent stamps showed portraits of Meriwether Lewis and William Clark. A special 32-page booklet accompanied the issue in eleven cities along the route taken by the Corps of Discovery. An image of the stamp can be found on Arago online at the link in the footnote."Bicentennial Lewis
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Clark Expedition Issue", Arago: people, postage
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the post, National Postal Museum online, viewed April 28, 2014. An image of the stamp can be seen at Arago online, 37c Lewis and Clark on Hill stamp.
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140px|<center>Richard E. Byrd, Antarctica1933 issue Late American explorers included Richard Byrd. The United States maintains research facilities in Antarctica without making territorial claims there, along with other international bases there.
D
Richard E. Byrd's Byrd Antarctic Expedition II was commemorated on a 3-cent stamp the same size and shape as Special Delivery on September 22, 1933. Intended for the collectors' market alone, the 'philatelic mail' with this stamp was carried by the expedition and postmarked at the Little America post office, the expedition's base camp.Lawson, Mary H.,"Byrd Antarctic Issue", Arago: people, postage
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the post, National Postal Museum. Viewed March 22, 2014.