We look beyond a cluster of flags hanging from the side of one tall building onto a wide street at a row of buildings across from us in this vertical painting. The scene is loosely painted with visible brushstrokes, so some details are difficult to make out. We seem to lean out a window to look along the street, so the building to our right only skims the edge of the composition and continues off the top. The three flags closest to us fly from nearly horizontal flagstaffs along the bottom edge of the painting. All the flags are in shades of scarlet red, white, and royal blue. The flag closest to us is red with the red, white, and blue Union Jack in the upper corner. Beyond it is an American flag with 49 stars, and then the French flag with the vertical bands of blue, white, and red. Those three flags are repeated about a dozen times along the building that stretches away from us, along the right edge of the painting. More of those flags are hung from the cream-white and tan buildings across the street, to our left. Some of those buildings reach off the top edge of the canvas and others come close. The shadows along moldings and the windows are painted with pale and lapis blue. Through narrow gaps left between the fluttering flags, vertical strokes of navy blue and violet purple suggest crowds of people in the street below. The sky between the buildings is ice blue. The artist signed and dated the painting in the center left, “Childe Hassam May 17 1917.”

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   This painting commemorates the nation’s entry into World War I in spring 1917. Childe Hassam shows Fifth Avenue in New York City decorated with red, white, and blue flags. It had been declared “the Avenue of the Allies” in honor of the military alliance between the United States, Great Britain, and France.

   This is part of a series of flag images in which Hassam used brilliant sunlight and color in the style of the French impressionists. The breezy, celebratory air glosses over the horrors of modern warfare that American soldiers would face fighting in Europe.

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   A patriotic whirlwind overtook mid–town Manhattan as America entered the First World War in the spring of 1917. On Fifth Avenue, the British Union Jack, the French Tricolor, and Stars and Stripes were displayed prominently during parades honoring America's allies. The colorful pageantry inspired Childe Hassam, who dedicated this picture "to the coming together of [our] three peoples in the fight for democracy." Hassam's flag paintings were first shown as a group in New York's Durand–Ruel Gallery in November 1918, just four days after the armistice was declared. Thus, the works, originally created to herald America's entry into the war, also served to commemorate its victorious resolution.

   Hassam had studied in Paris from 1886–1889 and was strongly influenced by the impressionists. In many respects, Allies Day resembles the vibrant boulevard paintings of Monet and Pissarro. Like these contemporary French artists, Haassam selected a high vantage point overlooking a crowded urban thoroughfare to achieve an illusion of dramatic spatial recession. But, rather than using daubs of shimmering pigment to dissolve form, he applied fluid parallel paint strokes to create an architectonic patterning. Although he shared the impressionists' interest in bright colors, broken brushwork, and modern themes, Hassam's overall approach was less theoretical and his pictorial forms remained far more substantial than those of his European contemporaries.

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