Question: What classification of film is shared by 'An American Opera', which chronicles events following Hurricane Katrina and 'Fear of a Black Republican', which examines the lack of African Americans in the Republican Party? 

Context articles: Southern strategy
An American Opera
Ivor van Heerden
Diary from the Dome
Fear of a Black Republican
List of Category 4 Atlantic hurricanes
African-American teachers
Idlewild Blue (Don'tchu Worry 'Bout Me)
African-American bookstores
The Marmot's Hole

In American politics, the southern strategy was a Republican Party electoral strategy to increase political support among white voters in the South by appealing to racism against African Americans.
 As the Civil Rights Movement and dismantling of Jim Crow laws in the 1950s and 1960s visibly deepened existing racial tensions in much of the Southern United States, Republican politicians such as presidential candidate Richard Nixon and Senator Barry Goldwater developed strategies that successfully contributed to the political realignment of many white, conservative voters in the South to the Republican Party that had traditionally supported the Democratic Party.
 It also helped push the Republican Party much more to the right.
An American Opera: The Greatest Pet Rescue Ever!
 is a multi-award-winning documentary film by Tom McPhee chronicling the events following Hurricane Katrina in New Orleans, Louisiana when pet owners were forced to evacuate without their pets.
 "An American Opera" follows the pets, vets, owners, officials, rescuers, and adopters of animals as they try to remedy the situation, revealing that not everyone had the same goal of saving animals.
 Tom McPhee directed, narrated, and produced the film with the production companies Man Smiling Moving Pictures and Cave Studio.
Dr. Ivor van Heerden, Ph.D., holds a doctorate degree in Marine Sciences and was the deputy director of the Louisiana State University (LSU) Hurricane Center, before being dismissed by LSU with no reason given, following Hurricane Katrina.
 He is also the director of the Center for the Study of Public Health Impacts of Hurricanes.
Diary From the Dome: Reflections on Fear and Privilege During Katrina is a memoir written by Paul Harris and was the first one written about what it was like inside of the Louisiana Superdome during Hurricane Katrina.
 It was published by Vantage Press in 2008.
 Evacuees used the Superdome in New Orleans as a refuge of last resort beginning the day before Hurricane Katrina hit landfall on August 29, 2005.
 The book details the author's experiences as a California tourist who was unable to evacuate New Orleans as the Airport, Amtrak, and Greyhound Bus station all closed a day prior to the mandatory evacuation and two days prior to the Category 3 storm hitting landfall.
Fear of a Black Republican is an American independent political documentary which examines the lack of Minorities and especially African Americans in the Republican Party in the United States.
 The documentary film had its theatrical premiere in Washington, DC on March 22, 2012 and has screened around the United States at theatres, film festivals, colleges and universities and museums.
 Produced over six years by the married filmmaking team of Kevin and Tamara Williams, the film takes a non-partisan point-of-view of the American two-party political system and why the Republican Party has so few Black and Urban supporters.
Category 4 hurricanes are tropical cyclones that reach Category 4 intensity on the Saffir–Simpson Hurricane Scale.
 Category 4 hurricanes that later attained Category 5 strength are not included in this list.
 The Atlantic basin includes the open waters of the Atlantic Ocean, the Caribbean Sea and the Gulf of Mexico.
 Category 4 is the second-highest hurricane classification category on the Saffir–Simpson Hurricane Scale, and storms that are of this intensity maintain maximum sustained winds of 113–136 knots (130–156 mph, 209–251 km/h).
 Based on the Atlantic hurricane database, 94 hurricanes have attained Category 4 hurricane status since 1851, the start of modern meteorological record keeping.
 Category 4 storms are considered extreme hurricanes.
 Hurricane Ike, which was a Category 4 storm, brought on a 24 ft storm surge, the third greatest storm surge ever recorded (after Hurricane Katrina and Hurricane Camille, respectively).
African-American teachers educated African Americans and taught each other to read during slavery in the South.
 Slaves ran small schools in secret, since teaching a slave to read was a crime (see Slavery in the United States#Slave codes).
 While, in the North, African Americans worked alongside with Whites.
 Many privileged African Americans in the North wanted their children taught with White children, and were pro-integration.
 The Black middle class preferred segregation.
 During the post-Reconstruction era African Americans built their own schools so they didn't have White control.
 The Black middle class believed that it could provide quality education for their community.
 This resulted in the foundation of teaching as a profession for Blacks.
 Some Black families had multiple individuals who dedicated their lives to teaching.
 They felt that they could empower their communities.
 In the late 19th and early 20th centuries, Southern States passed Jim Crow laws to mandate racial segregation in all aspects of society, and prevent Blacks from voting.
 Racism made it difficult for Black professionals to work in other professions.
 In 1950, African American teachers made up about half of African-American professionals.
"Idlewild Blue (Don'tchu Worry 'Bout Me)" is the third single released from hip-hop duo OutKast's sixth studio album, "Idlewild", and the first from the album that is sung by André 3000.
 Andre also plays the guitar for the song, using the standard 12-bar blues.
 The song tells the story of a character wishing to gain his independence by leaving the familiarity of his family, friends and town.
 The video shows Andre and the band playing in an old house during a thunder storm, with people dancing around him.
 The building slowly fills with rain water, and by the end of the video, everything in the house is underwater.
 Because of the proximity in which the video was filmed, some viewers interpret the video to be a visual allusion to the New Orleans flooding following Hurricane Katrina, while others think the water represents the "blues" that can flood over someone's life.
 The end of the video features a text that reads, "Dedicated to all those tryin' to stay afloat."
African-American bookstores, also known as black bookstores, are bookstores owned and operated by African Americans.
 These stores often, although not always, specialize in works by and about African Americans and their target customers are often African Americans.
 Although they are a variety of African-American business, African American bookstores have often been closely tied to radical political movements including Marxism, Black Power, and pan-Africanism.
The first documented African-American bookstore was established by the abolitionist David Ruggles in 1834.
 One of the earliest African-American bookstores to achieve national prominence was Lewis Michaux's National Memorial African Bookstore, which operated in Harlem from the early 1930s to the middle of the 1970s.
 Michaux's store doubled as a meeting place for black activists, including most famously Malcolm X.
 The Black Power movement embraced black-owned bookstores in the 1960s and '70s as vehicles for promoting their ideology and creating radical political spaces in black communities across the United States.
 By the 1990s, African-American bookstores earned significant attention from more politically moderate and business oriented media outlets such as the magazine Black Enterprise.
 In the 2000s and 2010s, however, as independent bookstores of all kinds declined and bookstores chains and Amazon increasingly sold black-authored books, the number of African-American bookstores declined rapidly, dropping from over 250 to just over 70.
The Marmot's Hole was a weblog by American writer Robert J Koehler dealing with Korean politics and society.
 It was believed to be the most widely read English-language blog dealing with Korea-related topics.
 Because of this status, it was frequently used as a source for news stories about the expat community.
 In addition, many international sources turned to it for reaction after the 2006 North Korean nuclear test.
 The Marmot's Hole also received attention from Korean media, notably on the occasion of its recommendation for Americans to thank South Korea for aid following Hurricane Katrina.
 The blog first gained media attention in 2004, with a "Korea Times" piece on expat blogs.
 Citing a lack of motivation to continue the blog, it was closed by the owner, Robert, in December 2015.