Question: Both Green River and Phantogram are bands of which nationality?

Context paragraphs:
Soo River: The Soo River is a tributary of the Green River in the Pacific Ranges of the Coast Mountains in British Columbia, Canada, joining that river just north of the Resort Municipality of Whistler.  Approximately 35 km long, it begins on the south flank of the Pemberton Icefield.  Its course is generally eastward from there to the Green River valley, although upon reaching that valley it runs north for about 3.5 km roughly parallel to the Green before joining it.  For much of its course, known as the Soo Valley, it forms a serpentine marshland until reaching a short canyon before entering the valley of the Green River.

Green River Formation: The Green River Formation is an Eocene geologic formation that records the sedimentation in a group of intermountain lakes in three basins along the present-day Green River in Colorado, Wyoming, and Utah.  The sediments are deposited in very fine layers, a dark layer during the growing season and a light-hue inorganic layer in the dry season.  Each pair of layers is called a varve and represents one year.  The sediments of the Green River Formation present a continuous record of six million years.  The mean thickness of a varve here is 0.18 mm, with a minimum thickness of 0.014 mm and maximum of 9.8 mm.

Green River (Oregon): The Green River is a tributary of Five Rivers in the U.S. state of Oregon.  It arises in the Siuslaw National Forest of the Central Oregon Coast Range and flows generally northeast to meet Five Rivers upstream of the rural community of Fisher.  The confluence is about 15 mi from the larger stream's confluence with the Alsea River.  The Green River's named tributaries from source to mouth are the East Fork Green River and Ryan Creek.

Green River Presbyterian Church: Green River Presbyterian Church (also known as Green River Bible Church) is a historic Presbyterian church at 134 W. Third Avenue in Green River, Utah.

Green River (Colorado River): The Green River, located in the western United States, is the chief tributary of the Colorado River.  The watershed of the river, known as the Green River Basin, covers parts of Wyoming, Utah, and Colorado.  The Green River is 730 mi long, beginning in the Wind River Mountains of Wyoming and flowing through Wyoming and Utah for most of its course, except for 40 mi into western Colorado.  Much of the route is through the Colorado Plateau and through some of the most spectacular canyons in the United States.  It is only slightly smaller than the Colorado when the two rivers merge, but typically carries a larger load of silt.  The average yearly mean flow of the river at Green River, Utah is 6121 cuft per second.

Green River (band): Green River was an American rock band from Seattle, Washington.  Although the band had little commercial impact outside of its native Seattle, it proved to have significant influence on the genre later known as grunge, both with its own music and with the music its members would create in future bands including Pearl Jam and Mudhoney.  Green River reunited for several live shows in 2008 and 2009.

Major Powell (screw): Major Powell was a 3 ton, twin screw driven steamboat built and launched in 1891 on the Green River at Green River, Utah, in August 1891.  Its owner was the Green Grand & Colorado River Navigation Company headed by B. S. Ross.  The company was formed to run a line of excursion steamers down the Green River to its conjunction with the Colorado River and four miles down the Colorado as far as the first cataract at the head of Cataract Canyon, to a hotel to be built for tourists.  The "Major Powell" was 35 feet long and 8 feet abeam, with a 26 inch draft.  It had an open deck covered by a canvas canopy.  Its two 6 horsepower steam engines were coal-fired, each driving one of the twin screws.

Phantogram (band): Phantogram (formerly Charlie Everywhere) is an American music duo from Greenwich, New York, formed in 2007 and consisting of Josh Carter (vocals, guitars) and Sarah Barthel (vocals, keyboards).  The band name was inspired by an optical illusion called a phantogram, in which two-dimensional images appear to be three-dimensional.

Green River (North Carolina): The Green River is a dam-release river that flows through the mountains of North Carolina, south of Asheville.  The Green has numerous tributaries, but much of its water flows from a confluence with Big Hungry Creek.  The Green River is itself a tributary of the Broad River.  The river is dammed to form Lake Summit, in Tuxedo, North Carolina, and Lake Adger near Mill Spring, NC.  The Green River is named for its deep green color but runs brown after heavy rains.

Blacks Fork: Blacks Fork (also referred to as Blacks Fork of the Green River) is a 175 mi tributary of the Green River in Utah and Wyoming.  The river rises on the northern side of the Uinta Mountains as the combination of three streams draining the area around Tokewanna Peak near the Utah-Wyoming border.  Right as the river crosses the Wyoming border, it flows into Meeks Cabin Reservoir which is used for irrigation and flood control.  From there the river flows through the town of Lyman before joining with the Smiths Fork (possibly named for Jedediah Smith), which forms just east of the Blacks Fork in the Uintas, and parallels it for most of its course.  The river continues northeast to Granger, where the river meets the Hams Fork from the north.  Shortly thereafter the river makes a sharp turn south, eventually joining the Green River at Flaming Gorge Reservoir.

Supporting paragraphs: Green River (band) Phantogram (band)
Answer: American