Question: When the did US declare war on Japan relative to Great Britain?
About the article "Attack on Pearl Harbor", section "Aftermath".

Candidate passages:
The Treaty of Paris concluded on January 6, 1810, forced Sweden to join the Continental System, a trade embargo against Great Britain.
Since Great Britain was Sweden's biggest trade partner this caused economic difficulties, and the trade continued to take place through smuggling.
On November 13, 1810, France delivered an ultimatum to the Swedish government demanding that within five days Sweden: Declare war against Great Britain, Confiscate all British ships in Swedish ports, Seize all British products in Sweden.
France and its allies threatened to declare war against Sweden if Sweden did not meet the French demands.
On November 17, the Swedish government declared war against Great Britain. 
Joint Army and Navy Basic War Plan Red was a war plan created by the United States Army and Navy in the late 1920s and early 1930s to estimate the requirements for a hypothetical war with Great Britain (the "Red" forces).
War Plan Red discussed the potential for fighting a war with Britain and its Empire and outlined those steps necessary to defend the Atlantic coast against any attempted mainland invasion of the United States.
It further discussed fighting a two-front war with both Japan and Britain simultaneously (as envisioned in War Plan Red-Orange).
War Plan Red was not operationalized and did not have presidential or Congressional approval.
In the U.S. only the Congress can declare war, and it made no war plans.
President Herbert Hoover was known as a pacifist.
War Plan Red was developed by the United States Army following the 1927 Geneva Naval Conference and approved in May 1930 by the Secretary of War and the Secretary of Navy and updated in 1934–35.
In 1939 on the outbreak of World War II and Britain's war against Nazi Germany, a decision was taken that no further planning was required but that the plan be retained.
War Plan Red was not declassified until 1974.
The war plan outlined those actions that would be necessary to initiate war between Britain and the United States.
The plan suggested that the British would initially have the upper hand by virtue of the strength of the Royal Navy.
The plan further assumed that Britain would probably use its Dominion in Canada as a springboard from which to initiate a retaliatory invasion of the United States.
The assumption was taken that at first Britain would fight a defensive battle against invading American forces, but that the US would eventually defeat the British by blockading the United Kingdom and economically isolating it. 
On December 7, 1941, the Empire of Japan launched an attack on Pearl Harbor, Hawaii, beginning a war between Japan and the United States.
According to the terms of the Anti-Comintern Pact, Germany was obliged to come to the aid of Japan if a third country attacked Japan, but not if Japan attacked a third country.
Nevertheless, the German government chose to declare war on the United States, partially in response to previous acts of Anglo-American cooperation such as the Destroyers for Bases Agreement, Lend-Lease, the Atlantic Charter, the hand over of military control of Iceland from the United Kingdom to the United States, the extension of the Pan-American Security Zone, etc.
The German declaration of war came as a great relief to British Prime Minister Winston Churchill, who feared the possibility of two parallel disconnected wars (UK and Soviet Union versus Germany in Europe, US versus Japan in the Pacific).
With Nazi Germany's declaration against the United States in force, American assistance for Britain in both theaters of war as a full ally was assured. 
In 1910 a national currency was introduced by the Labor Government of Prime Minister Andrew Fisher.
The new national currency was called the Australian pound, consisting of 20 shillings, each consisting of 12 pence.
Monetary policy ensured that the Australian pound was fixed in value to the pound sterling.
As such Australia was on the gold standard so long as Britain was.
In 1914, the pound sterling was removed from the gold standard.
When it was returned to the gold standard in 1925, the sudden increase in its value (imposed by the nominal gold price) unleashed crushing deflationary pressures.
Both the initial 1914 inflation and the subsequent 1926 deflation had far-reaching economic effects throughout the British Empire, Australia and the world.
In 1929, as an emergency measure during the Great Depression, Australia left the gold standard, resulting in a devaluation relative to sterling.
A variety of pegs to sterling applied until December 1931, when the government set a rate of £1 Australian = 16 shillings sterling (£1·5s Australian = £1 sterling).
During World War II, the Empire of Japan produced currency notes, some denominated in the Australian pound, for use in Pacific countries intended for occupation.
Since Australia was never occupied, the occupation currency was not used there, but it was used in the captured parts of the then-Australian territories of Papua and New Guinea.
In 1949, when the United Kingdom devalued the pound sterling against the US dollar, Australian Prime Minister and Treasurer Ben Chifley followed suit so the Australian pound would not become over-valued in sterling zone countries with which Australia did most of its external trade at the time.
As the pound sterling went from US$4.03 to US$2.80, the Australian pound went from US$3.224 to US$2.24. 
Diplomacy takes place in 1939 as well as in subsequent years.
The USA receives extra DPs as US-Axis Tensions rise.
Each country may allocate 1/3 (rounded up) of its DPs to a single target.
Allies, European Axis and Russians (there is no diplomacy in the Pacific) may roll for a single country each turn, provided a friendly DP has been placed in it (a country can normally be named only once in a year) – in addition to activating one DP in US-Axis Tensions each turn (DPs may not be placed in Russo-German Tensions), and making reaction rolls for Norway, Spain (the Germans get a favourable modifier if the Allies attack Portugal), Vichy France and Balkan countries as appropriate.
Russia may only allocate DPs to Balkan and other neighbouring countries.
A small random element has been added to US-Axis Tensions and US-Japanese Tensions (but not Russo-German Tensions) so it is harder to keep the USA neutral by “gaming” the table.
Germany may declare war on the USA, as in reality, for free, gaining a two-turn “happy time” for her U-boats.
Japan may declare war on the USA for free, but if so must pay to declare war on Britain (if she declares war on Britain alone this sharply accelerates USJT and US mobilisation).
The USA may declare war on Japan for free, if allowed by US-Japanese Tensions - this puts Britain at war with Japan as well.
The minor country diplomatic tables have been standardised, with high numbers for pro-Axis results.
Favourable results may gain the relevant major power BRPs, hex control (a limited number of the major power’s units may trace supply through and remain in the minor country), association (which also results from an attack by an enemy major power), or full activation as a minor ally.
The controlling major power may now only rebuild 1 armour unit and 1 AAF each turn; minor allies and associated minors may rebuild a single infantry unit of up to 2 factors each turn for free, so the Rumanian army is harder to rebuild if lost in Russia.
Minor countries may still switch sides by diplomatic roll, as Rumania did in 1944.
Iraqi and Persian forces (like those of Egypt) now consist of partisans rather than infantry, easing Britain's Middle Eastern defence burden somewhat.
Anybody may declare war on Belgium and Luxembourg, or Denmark and Norway, as single entities.
Denmark no longer has any units, and is deemed to have surrendered at the start of the turn on which she is attacked, so the attacker (i.e.
Germany) may place an airbase on her soil.
Iron ore shipments from Sweden to Germany are disrupted if Sweden becomes anti-German, and are shipped via Norway in winter and spring (because of ice in the Baltic Sea) so are disrupted if the Allies control Bergen, or mine Norwegian waters - if done against Norway’s will this reduces US-Axis Tensions (i.e.
making the USA less likely to join the Allies), increases future Norwegian rolls by 1, and allows Germany a reaction die roll.
This disruption ends if Germany gains diplomatic or military control of Norway.
Norway is also important for German atomic research.
Finland may be a German diplomatic target at any time, even if no DPs have been placed there.