The peanut butter and jelly sandwich is such a staple of American childhood that it seems like it has been around forever. In fact, there are people alive today in America who grew up in a world when the PB&J sandwich was not well-known. The first known reference to a peanut butter and jelly sandwich was in a 1901 cookbook.
The first reference of peanut butter dates back to about 1000 BC with the Ancient Incas. Records show both Africans and Chinese grinding peanuts into a paste early in the 15th century. Marcellus Gilmore Edson of Montreal, Quebec was the first person to patent peanut butter. He was issued with US patent #306727 in 1884. J.H. Kellogg of cereal fame, secured US patent #580787 in 1897 for his 'Process of Preparing Nutmeal', which produced a "pasty adhesive substance" that Kellogg called 'nut-butter.' George Washington Carver was born only a few years before Edson's patent was issued and he did develop a number of uses for the peanut, but he did not invent peanut butter.
US law dictates that any product labeled “peanut butter” in the United States must be at least 90 percent peanut. Eighty percent of the peanut butter sold in the U.S. is creamy, while seventeen percent is crunchy. The rest is mixed.
The jelly part of the sandwich could mean jelly, jam, or other fruit preserves. It has also been around for a long time, going all the way back to at least the first century, mentioned in 'Of Culinary Matters' by Marcus Gavius Apicius.
Mr. Welch developed Grapelade from Concord grapes in 1918, which proved to be extremely popular among the troops during World War I. When they got back from the war, they spread the practice of using it on bread. I just enjoyed a PB&J on a toasted English Muffin.